123440100 has 144 divisors (see below), whose sum is σ = 417973248. Its totient is φ = 27538560.

The previous prime is 123440099. The next prime is 123440101. The reversal of 123440100 is 1044321.

It is an interprime number because it is at equal distance from previous prime (123440099) and next prime (123440101).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 123440100.

It is not an unprimeable number, because it can be changed into a prime (123440101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89617 + ... + 90983.

It is an arithmetic number, because the mean of its divisors is an integer number (2902592).

Almost surely, 2^123440100 is an apocalyptic number.

123440100 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 123440100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208986624).

123440100 is an abundant number, since it is smaller than the sum of its proper divisors (294533148).

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

123440100 is a wasteful number, since it uses less digits than its factorization.

123440100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 123440100 is about 11110.3600301700. The cubic root of 123440100 is about 497.9114211578.

Adding to 123440100 its reverse (1044321), we get a palindrome (124484421).

The spelling of 123440100 in words is "one hundred twenty-three million, four hundred forty thousand, one hundred".