2156949388 has 48 divisors (see below), whose sum is σ = 4370567040. Its totient is φ = 928786320.

The previous prime is 2156949371. The next prime is 2156949391. The reversal of 2156949388 is 8839496512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90495 + ... + 111817.

It is an arithmetic number, because the mean of its divisors is an integer number (91053480).

Almost surely, 2^2156949388 is an apocalyptic number.

It is an amenable number.

2156949388 is an abundant number, since it is smaller than the sum of its proper divisors (2213617652).

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

2156949388 is a wasteful number, since it uses less digits than its factorization.

2156949388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21379 (or 21355 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 55.

The square root of 2156949388 is about 46442.9691987926. The cubic root of 2156949388 is about 1292.0519769049.

The spelling of 2156949388 in words is "two billion, one hundred fifty-six million, nine hundred forty-nine thousand, three hundred eighty-eight".