155868638 has 16 divisors (see below), whose sum is σ = 239328000. Its totient is φ = 76100376.

The previous prime is 155868617. The next prime is 155868641. The reversal of 155868638 is 836868551.

It is a congruent 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, 45245 + ... + 48567.

It is an arithmetic number, because the mean of its divisors is an integer number (14958000).

Almost surely, 2^155868638 is an apocalyptic number.

155868638 is a deficient number, since it is larger than the sum of its proper divisors (83459362).

155868638 is a wasteful number, since it uses less digits than its factorization.

155868638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871.

The product of its digits is 1382400, while the sum is 50.

The square root of 155868638 is about 12484.7362006572. The cubic root of 155868638 is about 538.1701184402.

The spelling of 155868638 in words is "one hundred fifty-five million, eight hundred sixty-eight thousand, six hundred thirty-eight".