79138340 has 12 divisors (see below), whose sum is σ = 166190556. Its totient is φ = 31655328.

The previous prime is 79138327. The next prime is 79138343. The reversal of 79138340 is 4383197.

It can be written as a sum of positive squares in 2 ways, for example, as 15808576 + 63329764 = 3976^2 + 7958^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 79138340.

It is not an unprimeable number, because it can be changed into a prime (79138343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978439 + ... + 1978478.

It is an arithmetic number, because the mean of its divisors is an integer number (13849213).

Almost surely, 2^79138340 is an apocalyptic number.

It is an amenable number.

79138340 is an abundant number, since it is smaller than the sum of its proper divisors (87052216).

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

79138340 is a wasteful number, since it uses less digits than its factorization.

79138340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956926 (or 3956924 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 79138340 is about 8895.9732463626. The cubic root of 79138340 is about 429.3343586150.

The spelling of 79138340 in words is "seventy-nine million, one hundred thirty-eight thousand, three hundred forty".