156989 has 8 divisors (see below), whose sum is σ = 184128. Its totient is φ = 131040.

The previous prime is 156979. The next prime is 157007. The reversal of 156989 is 989651.

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

It is not a de Polignac number, because 156989 - 2⁸ = 156733 is a prime.

It is a super-2 number, since 2×156989² = 49291092242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14 + ... + 560.

It is an arithmetic number, because the mean of its divisors is an integer number (23016).

2¹⁵⁶⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

156989 is a deficient number, since it is larger than the sum of its proper divisors (27139).

156989 is an equidigital number, since it uses as much as digits as its factorization.

156989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595.

The product of its digits is 19440, while the sum is 38.

The square root of 156989 is about 396.2183741322. The cubic root of 156989 is about 53.9456471851.

The spelling of 156989 in words is "one hundred fifty-six thousand, nine hundred eighty-nine".