79807138 has 12 divisors (see below), whose sum is σ = 120986082. Its totient is φ = 39482880.

The previous prime is 79807121. The next prime is 79807141. The reversal of 79807138 is 83170897.

It can be written as a sum of positive squares in 3 ways, for example, as 78801129 + 1006009 = 8877^2 + 1003^2 .

It is a junction number, because it is equal to n+sod(n) for n = 79807094 and 79807103.

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, 16698 + ... + 20938.

Almost surely, 2^79807138 is an apocalyptic number.

79807138 is a deficient number, since it is larger than the sum of its proper divisors (41178944).

79807138 is an equidigital number, since it uses as much as digits as its factorization.

79807138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437 (or 4340 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 79807138 is about 8933.4840907677. The cubic root of 79807138 is about 430.5404022311.

The spelling of 79807138 in words is "seventy-nine million, eight hundred seven thousand, one hundred thirty-eight".