155939 has 4 divisors (see below), whose sum is σ = 178224. Its totient is φ = 133656.

The previous prime is 155921. The next prime is 156007. The reversal of 155939 is 939551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155939 - 2¹⁶ = 90403 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155939.

It is not an unprimeable number, because it can be changed into a prime (155539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11132 + ... + 11145.

It is an arithmetic number, because the mean of its divisors is an integer number (44556).

2¹⁵⁵⁹³⁹ is an apocalyptic number.

155939 is a deficient number, since it is larger than the sum of its proper divisors (22285).

155939 is an equidigital number, since it uses as much as digits as its factorization.

155939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22284.

The product of its digits is 6075, while the sum is 32.

The square root of 155939 is about 394.8911242355. The cubic root of 155939 is about 53.8251086256.

The spelling of 155939 in words is "one hundred fifty-five thousand, nine hundred thirty-nine".