2138930788 has 6 divisors (see below), whose sum is σ = 3743128886. Its totient is φ = 1069465392.

The previous prime is 2138930741. The next prime is 2138930789. The reversal of 2138930788 is 8870398312.

It can be written as a sum of positive squares in only one way, i.e., 1257553444 + 881377344 = 35462^2 + 29688^2 .

It is not an unprimeable number, because it can be changed into a prime (2138930789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 267366345 + ... + 267366352.

Almost surely, 2^2138930788 is an apocalyptic number.

It is an amenable number.

2138930788 is a deficient number, since it is larger than the sum of its proper divisors (1604198098).

2138930788 is a wasteful number, since it uses less digits than its factorization.

2138930788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534732701 (or 534732699 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 2138930788 is about 46248.5760645666. The cubic root of 2138930788 is about 1288.4440885035. Note that the first 3 decimals are identical.

The spelling of 2138930788 in words is "two billion, one hundred thirty-eight million, nine hundred thirty thousand, seven hundred eighty-eight".