2157740140 has 12 divisors (see below), whose sum is σ = 4531254336. Its totient is φ = 863096048.

The previous prime is 2157740093. The next prime is 2157740171. The reversal of 2157740140 is 410477512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53943484 + ... + 53943523.

It is an arithmetic number, because the mean of its divisors is an integer number (377604528).

Almost surely, 2^2157740140 is an apocalyptic number.

2157740140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157740140 is an abundant number, since it is smaller than the sum of its proper divisors (2373514196).

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

2157740140 is a wasteful number, since it uses less digits than its factorization.

2157740140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107887016 (or 107887014 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 2157740140 is about 46451.4815694828. The cubic root of 2157740140 is about 1292.2098492319.

The spelling of 2157740140 in words is "two billion, one hundred fifty-seven million, seven hundred forty thousand, one hundred forty".