2156916 has 12 divisors (see below), whose sum is σ = 5032832. Its totient is φ = 718968.

The previous prime is 2156897. The next prime is 2156939. The reversal of 2156916 is 6196512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×2156916³ = 30103774413332349888, which contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89860 + ... + 89883.

2^2156916 is an apocalyptic number.

It is an amenable number.

2156916 is an abundant number, since it is smaller than the sum of its proper divisors (2875916).

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

2156916 is a wasteful number, since it uses less digits than its factorization.

2156916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179750 (or 179748 counting only the distinct ones).

The product of its digits is 3240, while the sum is 30.

The square root of 2156916 is about 1468.6442727904. The cubic root of 2156916 is about 129.2045310197.

The spelling of 2156916 in words is "two million, one hundred fifty-six thousand, nine hundred sixteen".