2157384690 has 48 divisors (see below), whose sum is σ = 5612226048. Its totient is φ = 574992288.

The previous prime is 2157384689. The next prime is 2157384703. The reversal of 2157384690 is 964837512.

2157384690 is a `hidden beast` number, since 2 + 157 + 38 + 469 + 0 = 666.

2157384690 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2157384690² = 9308617401292792200, which contains 22 as substring.

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

2157384690 is strictly pandigital in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196527 + ... + 207213.

It is an arithmetic number, because the mean of its divisors is an integer number (116921376).

It is a 1-persistent number, because it is pandigital, but 2⋅2157384690 = 4314769380 is not.

Almost surely, 2^2157384690 is an apocalyptic number.

2157384690 is an abundant number, since it is smaller than the sum of its proper divisors (3454841358).

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

2157384690 is a wasteful number, since it uses less digits than its factorization.

2157384690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12943 (or 12940 counting only the distinct ones).

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

The square root of 2157384690 is about 46447.6553767787. The cubic root of 2157384690 is about 1292.1388890011.

The spelling of 2157384690 in words is "two billion, one hundred fifty-seven million, three hundred eighty-four thousand, six hundred ninety".