2138208732 has 48 divisors (see below), whose sum is σ = 6047462400. Its totient is φ = 647941680.

The previous prime is 2138208691. The next prime is 2138208769. The reversal of 2138208732 is 2378028312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 898732 + ... + 901107.

It is an arithmetic number, because the mean of its divisors is an integer number (125988800).

Almost surely, 2^2138208732 is an apocalyptic number.

2138208732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2138208732 is an abundant number, since it is smaller than the sum of its proper divisors (3909253668).

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

2138208732 is a wasteful number, since it uses less digits than its factorization.

2138208732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799863 (or 1799855 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 2138208732 is about 46240.7691545026. The cubic root of 2138208732 is about 1288.2990887221.

The spelling of 2138208732 in words is "two billion, one hundred thirty-eight million, two hundred eight thousand, seven hundred thirty-two".