2157864930 has 48 divisors (see below), whose sum is σ = 6042025080. Its totient is φ = 531166464.

The previous prime is 2157864923. The next prime is 2157864931. The reversal of 2157864930 is 394687512.

2157864930 is a `hidden beast` number, since 2 + 1 + 578 + 6 + 49 + 30 = 666.

2157864930 is digitally balanced in base 6 and base 10, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1848914001 + 308950929 = 42999^2 + 17577^2 .

It is a super-2 number, since 2×2157864930² = 9312762112247809800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

2157864930 is strictly pandigital in base 10.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2157864931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 920995 + ... + 923334.

It is a 2-persistent number, because it is pandigital, and so is 2⋅2157864930 = 4315729860, but 3⋅2157864930 = 6473594790 is not.

Almost surely, 2^2157864930 is an apocalyptic number.

2157864930 is an abundant number, since it is smaller than the sum of its proper divisors (3884160150).

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

2157864930 is a wasteful number, since it uses less digits than its factorization.

2157864930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844355 (or 1844352 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 2157864930 is about 46452.8247795546. The cubic root of 2157864930 is about 1292.2347598247.

The spelling of 2157864930 in words is "two billion, one hundred fifty-seven million, eight hundred sixty-four thousand, nine hundred thirty".