2156900 has 18 divisors (see below), whose sum is σ = 4680690. Its totient is φ = 862720.

The previous prime is 2156897. The next prime is 2156939. The reversal of 2156900 is 96512.

It can be written as a sum of positive squares in 3 ways, for example, as 7744 + 2149156 = 88^2 + 1466^2 .

It is a super-2 number, since 2×2156900² = 9304435220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10685 + ... + 10884.

2^2156900 is an apocalyptic number.

2156900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156900 is an abundant number, since it is smaller than the sum of its proper divisors (2523790).

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

2156900 is a wasteful number, since it uses less digits than its factorization.

2156900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21583 (or 21576 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 2156900 is about 1468.6388255797. The cubic root of 2156900 is about 129.2042115392.

The spelling of 2156900 in words is "two million, one hundred fifty-six thousand, nine hundred".