2157803857 has 16 divisors (see below), whose sum is σ = 2462555520. Its totient is φ = 1871584000.

The previous prime is 2157803833. The next prime is 2157803909. The reversal of 2157803857 is 7583087512.

It is not a de Polignac number, because 2157803857 - 2¹⁹ = 2157279569 is a prime.

It is a super-2 number, since 2×2157803857² = 9312234970568152898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157803357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90819 + ... + 112087.

It is an arithmetic number, because the mean of its divisors is an integer number (153909720).

Almost surely, 2^2157803857 is an apocalyptic number.

It is an amenable number.

2157803857 is a deficient number, since it is larger than the sum of its proper divisors (304751663).

2157803857 is a wasteful number, since it uses less digits than its factorization.

2157803857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21704.

The product of its (nonzero) digits is 470400, while the sum is 46.

The square root of 2157803857 is about 46452.1674090671. The cubic root of 2157803857 is about 1292.2225685461. Note that the first 3 decimals are identical.

The spelling of 2157803857 in words is "two billion, one hundred fifty-seven million, eight hundred three thousand, eight hundred fifty-seven".