79399811 has 4 divisors (see below), whose sum is σ = 79468224. Its totient is φ = 79331400.

The previous prime is 79399783. The next prime is 79399823. The reversal of 79399811 is 11899397.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11899397 = 2903 ⋅4099.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79399811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79399861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32435 + ... + 34796.

It is an arithmetic number, because the mean of its divisors is an integer number (19867056).

Almost surely, 2^79399811 is an apocalyptic number.

79399811 is a deficient number, since it is larger than the sum of its proper divisors (68413).

79399811 is a wasteful number, since it uses less digits than its factorization.

79399811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68412.

The product of its digits is 122472, while the sum is 47.

The square root of 79399811 is about 8910.6571587061. The cubic root of 79399811 is about 429.8066753095.

The spelling of 79399811 in words is "seventy-nine million, three hundred ninety-nine thousand, eight hundred eleven".