239997138 has 16 divisors (see below), whose sum is σ = 480170496. Its totient is φ = 79969680.

The previous prime is 239997103. The next prime is 239997169. The reversal of 239997138 is 831799932.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16143 + ... + 27213.

It is an arithmetic number, because the mean of its divisors is an integer number (30010656).

Almost surely, 2^239997138 is an apocalyptic number.

239997138 is an abundant number, since it is smaller than the sum of its proper divisors (240173358).

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

239997138 is a wasteful number, since it uses less digits than its factorization.

239997138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14689.

The product of its digits is 734832, while the sum is 51.

The square root of 239997138 is about 15491.8410139015. The cubic root of 239997138 is about 621.4440309311. Note that the first 3 decimals are identical.

The spelling of 239997138 in words is "two hundred thirty-nine million, nine hundred ninety-seven thousand, one hundred thirty-eight".