2157279723 has 40 divisors (see below), whose sum is σ = 3313208448. Its totient is φ = 1398249216.

The previous prime is 2157279661. The next prime is 2157279727. The reversal of 2157279723 is 3279727512.

2157279723 is a `hidden beast` number, since 2 + 1 + 572 + 7 + 9 + 72 + 3 = 666.

2157279723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2157279723 - 2⁶ = 2157279659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157279727) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 482886 + ... + 487332.

Almost surely, 2^2157279723 is an apocalyptic number.

2157279723 is a deficient number, since it is larger than the sum of its proper divisors (1155928725).

2157279723 is a wasteful number, since it uses less digits than its factorization.

2157279723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4625 (or 4616 counting only the distinct ones).

The product of its digits is 370440, while the sum is 45.

The square root of 2157279723 is about 46446.5254136410. The cubic root of 2157279723 is about 1292.1179324322.

The spelling of 2157279723 in words is "two billion, one hundred fifty-seven million, two hundred seventy-nine thousand, seven hundred twenty-three".