2131989408 has 36 divisors (see below), whose sum is σ = 6062845698. Its totient is φ = 710663040.

The previous prime is 2131989383. The next prime is 2131989413. The reversal of 2131989408 is 8049891312.

It can be written as a sum of positive squares in only one way, i.e., 1896428304 + 235561104 = 43548^2 + 15348^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3701083 + ... + 3701658.

Almost surely, 2^2131989408 is an apocalyptic number.

It is an amenable number.

2131989408 is an abundant number, since it is smaller than the sum of its proper divisors (3930856290).

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

2131989408 is a wasteful number, since it uses less digits than its factorization.

2131989408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7402757 (or 7402746 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 2131989408 is about 46173.4708247063. The cubic root of 2131989408 is about 1287.0488006809.

The spelling of 2131989408 in words is "two billion, one hundred thirty-one million, nine hundred eighty-nine thousand, four hundred eight".