156990 has 16 divisors (see below), whose sum is σ = 376848. Its totient is φ = 41856.

The previous prime is 156979. The next prime is 157007. The reversal of 156990 is 99651.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 5233 = 156990 / (1 + 5 + 6 + 9 + 9 + 0).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

156990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2587 + ... + 2646.

It is an arithmetic number, because the mean of its divisors is an integer number (23553).

2¹⁵⁶⁹⁹⁰ is an apocalyptic number.

156990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

156990 is an abundant number, since it is smaller than the sum of its proper divisors (219858).

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

156990 is a wasteful number, since it uses less digits than its factorization.

156990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5243.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 156990 is about 396.2196360606. The cubic root of 156990 is about 53.9457617272.

The spelling of 156990 in words is "one hundred fifty-six thousand, nine hundred ninety".