155638 has 8 divisors (see below), whose sum is σ = 266832. Its totient is φ = 66696.

The previous prime is 155627. The next prime is 155653. The reversal of 155638 is 836551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5545 + ... + 5572.

It is an arithmetic number, because the mean of its divisors is an integer number (33354).

2¹⁵⁵⁶³⁸ is an apocalyptic number.

155638 is a deficient number, since it is larger than the sum of its proper divisors (111194).

155638 is a wasteful number, since it uses less digits than its factorization.

155638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11126.

The product of its digits is 3600, while the sum is 28.

The square root of 155638 is about 394.5098224379. The cubic root of 155638 is about 53.7904544914.

The spelling of 155638 in words is "one hundred fifty-five thousand, six hundred thirty-eight".