2157816 has 16 divisors (see below), whose sum is σ = 5394600. Its totient is φ = 719264.

The previous prime is 2157797. The next prime is 2157821. The reversal of 2157816 is 6187512.

2157816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 44931 + ... + 44978.

2^2157816 is an apocalyptic number.

It is an amenable number.

2157816 is an abundant number, since it is smaller than the sum of its proper divisors (3236784).

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

2157816 is a wasteful number, since it uses less digits than its factorization.

2157816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89918 (or 89914 counting only the distinct ones).

The product of its digits is 3360, while the sum is 30.

The square root of 2157816 is about 1468.9506458694. The cubic root of 2157816 is about 129.2224992527. Note that the first 3 decimals are identical.

The spelling of 2157816 in words is "two million, one hundred fifty-seven thousand, eight hundred sixteen".