156921 has 8 divisors (see below), whose sum is σ = 220320. Its totient is φ = 99072.

The previous prime is 156913. The next prime is 156941. The reversal of 156921 is 129651.

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

It is not a de Polignac number, because 156921 - 2³ = 156913 is a prime.

156921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 156891 and 156900.

It is not an unprimeable number, because it can be changed into a prime (156901) 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, 1320 + ... + 1433.

It is an arithmetic number, because the mean of its divisors is an integer number (27540).

2¹⁵⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

156921 is a deficient number, since it is larger than the sum of its proper divisors (63399).

156921 is a wasteful number, since it uses less digits than its factorization.

156921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775.

The product of its digits is 540, while the sum is 24.

The square root of 156921 is about 396.1325535727. The cubic root of 156921 is about 53.9378571833.

The spelling of 156921 in words is "one hundred fifty-six thousand, nine hundred twenty-one".