123243540 has 192 divisors, whose sum is σ = 428779008. Its totient is φ = 25804800.

The previous prime is 123243539. The next prime is 123243613. The reversal of 123243540 is 45342321.

It is a self number, because there is not a number n which added to its sum of digits gives 123243540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 292530 + ... + 292950.

It is an arithmetic number, because the mean of its divisors is an integer number (2233224).

Almost surely, 2^123243540 is an apocalyptic number.

123243540 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 123243540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214389504).

123243540 is an abundant number, since it is smaller than the sum of its proper divisors (305535468).

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

123243540 is a wasteful number, since it uses less digits than its factorization.

123243540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 123243540 is about 11101.5107080073. The cubic root of 123243540 is about 497.6469974617.

Adding to 123243540 its reverse (45342321), we get a palindrome (168585861).

The spelling of 123243540 in words is "one hundred twenty-three million, two hundred forty-three thousand, five hundred forty".