2639138930 has 8 divisors (see below), whose sum is σ = 4750450092. Its totient is φ = 1055655568.

The previous prime is 2639138921. The next prime is 2639138993. The reversal of 2639138930 is 398319362.

It can be written as a sum of positive squares in 2 ways, for example, as 2534014921 + 105124009 = 50339^2 + 10253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131956937 + ... + 131956956.

Almost surely, 2^2639138930 is an apocalyptic number.

2639138930 is a deficient number, since it is larger than the sum of its proper divisors (2111311162).

2639138930 is a wasteful number, since it uses less digits than its factorization.

2639138930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263913900.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 2639138930 is about 51372.5503552238. The cubic root of 2639138930 is about 1381.9343680937.

The spelling of 2639138930 in words is "two billion, six hundred thirty-nine million, one hundred thirty-eight thousand, nine hundred thirty".