2157868 has 12 divisors (see below), whose sum is σ = 3975160. Its totient is φ = 1022112.

The previous prime is 2157863. The next prime is 2157893. The reversal of 2157868 is 8687512.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14121 + ... + 14272.

2^2157868 is an apocalyptic number.

It is an amenable number.

2157868 is a deficient number, since it is larger than the sum of its proper divisors (1817292).

2157868 is a wasteful number, since it uses less digits than its factorization.

2157868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28416 (or 28414 counting only the distinct ones).

The product of its digits is 26880, while the sum is 37.

The square root of 2157868 is about 1468.9683454724. The cubic root of 2157868 is about 129.2235372646.

It can be divided in two parts, 2157 and 868, that added together give a square (3025 = 55²).

The spelling of 2157868 in words is "two million, one hundred fifty-seven thousand, eight hundred sixty-eight".