2157916 has 6 divisors (see below), whose sum is σ = 3776360. Its totient is φ = 1078956.

The previous prime is 2157913. The next prime is 2157923. The reversal of 2157916 is 6197512.

2157916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269736 + ... + 269743.

2^2157916 is an apocalyptic number.

It is an amenable number.

2157916 is a deficient number, since it is larger than the sum of its proper divisors (1618444).

2157916 is a wasteful number, since it uses less digits than its factorization.

2157916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539483 (or 539481 counting only the distinct ones).

The product of its digits is 3780, while the sum is 31.

The square root of 2157916 is about 1468.9846833783. The cubic root of 2157916 is about 129.2244954147.

The spelling of 2157916 in words is "two million, one hundred fifty-seven thousand, nine hundred sixteen".