123602640 has 320 divisors, whose sum is σ = 471398400. Its totient is φ = 26191872.

The previous prime is 123602639. The next prime is 123602641. The reversal of 123602640 is 46206321.

It is an interprime number because it is at equal distance from previous prime (123602639) and next prime (123602641).

It is a super-2 number, since 2×123602640² = 30555225229939200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 123602640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123602641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2094931 + ... + 2094989.

It is an arithmetic number, because the mean of its divisors is an integer number (1473120).

Almost surely, 2^123602640 is an apocalyptic number.

123602640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123602640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235699200).

123602640 is an abundant number, since it is smaller than the sum of its proper divisors (347795760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123602640 is a wasteful number, since it uses less digits than its factorization.

123602640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 123602640 is about 11117.6724182717. The cubic root of 123602640 is about 498.1298672612.

Adding to 123602640 its reverse (46206321), we get a palindrome (169808961).

The spelling of 123602640 in words is "one hundred twenty-three million, six hundred two thousand, six hundred forty".