79839813 has 16 divisors (see below), whose sum is σ = 111775680. Its totient is φ = 50620416.

The previous prime is 79839763. The next prime is 79839817. The reversal of 79839813 is 31893897.

It is not a de Polignac number, because 79839813 - 2¹⁸ = 79577669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79839817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1020 + ... + 12677.

It is an arithmetic number, because the mean of its divisors is an integer number (6985980).

Almost surely, 2^79839813 is an apocalyptic number.

It is an amenable number.

79839813 is a deficient number, since it is larger than the sum of its proper divisors (31935867).

79839813 is a wasteful number, since it uses less digits than its factorization.

79839813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13796.

The product of its digits is 326592, while the sum is 48.

The square root of 79839813 is about 8935.3126973822. The cubic root of 79839813 is about 430.5991521479.

The spelling of 79839813 in words is "seventy-nine million, eight hundred thirty-nine thousand, eight hundred thirteen".