239903978538 has 48 divisors (see below), whose sum is σ = 565209118080. Its totient is φ = 67676341824.

The previous prime is 239903978537. The next prime is 239903978539. The reversal of 239903978538 is 835879309932.

It is an interprime number because it is at equal distance from previous prime (239903978537) and next prime (239903978539).

It is a super-2 number, since 2×239903978538² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (239903978537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5141331 + ... + 5187782.

It is an arithmetic number, because the mean of its divisors is an integer number (11775189960).

Almost surely, 2^239903978538 is an apocalyptic number.

239903978538 is an abundant number, since it is smaller than the sum of its proper divisors (325305139542).

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

239903978538 is a wasteful number, since it uses less digits than its factorization.

239903978538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10329211 (or 10329204 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 66.

The spelling of 239903978538 in words is "two hundred thirty-nine billion, nine hundred three million, nine hundred seventy-eight thousand, five hundred thirty-eight".