2157168398 has 24 divisors (see below), whose sum is σ = 4064750256. Its totient is φ = 840454560.

The previous prime is 2157168389. The next prime is 2157168407. The reversal of 2157168398 is 8938617512.

It is an interprime number because it is at equal distance from previous prime (2157168389) and next prime (2157168407).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 635015 + ... + 638402.

It is an arithmetic number, because the mean of its divisors is an integer number (169364594).

Almost surely, 2^2157168398 is an apocalyptic number.

2157168398 is a deficient number, since it is larger than the sum of its proper divisors (1907581858).

2157168398 is a wasteful number, since it uses less digits than its factorization.

2157168398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273448 (or 1273437 counting only the distinct ones).

The product of its digits is 725760, while the sum is 50.

The square root of 2157168398 is about 46445.3269769952. The cubic root of 2157168398 is about 1292.0957057515.

The spelling of 2157168398 in words is "two billion, one hundred fifty-seven million, one hundred sixty-eight thousand, three hundred ninety-eight".