2639279138 has 16 divisors (see below), whose sum is σ = 4198173624. Its totient is φ = 1240124160.

The previous prime is 2639279129. The next prime is 2639279161. The reversal of 2639279138 is 8319729362.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2529385849 + 109893289 = 50293^2 + 10483^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36245 + ... + 81192.

Almost surely, 2^2639279138 is an apocalyptic number.

2639279138 is a deficient number, since it is larger than the sum of its proper divisors (1558894486).

2639279138 is a wasteful number, since it uses less digits than its factorization.

2639279138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118117.

The product of its digits is 979776, while the sum is 50.

The square root of 2639279138 is about 51373.9149569117. The cubic root of 2639279138 is about 1381.9588400684.

The spelling of 2639279138 in words is "two billion, six hundred thirty-nine million, two hundred seventy-nine thousand, one hundred thirty-eight".