2157389872 has 40 divisors (see below), whose sum is σ = 4579595280. Its totient is φ = 976404480.

The previous prime is 2157389849. The next prime is 2157389881. The reversal of 2157389872 is 2789837512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14704 + ... + 67312.

It is an arithmetic number, because the mean of its divisors is an integer number (114489882).

Almost surely, 2^2157389872 is an apocalyptic number.

2157389872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157389872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2289797640).

2157389872 is an abundant number, since it is smaller than the sum of its proper divisors (2422205408).

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

2157389872 is a wasteful number, since it uses less digits than its factorization.

2157389872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52861 (or 52855 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 52.

The square root of 2157389872 is about 46447.7111599700. The cubic root of 2157389872 is about 1292.1399235652.

The spelling of 2157389872 in words is "two billion, one hundred fifty-seven million, three hundred eighty-nine thousand, eight hundred seventy-two".