79806399 has 4 divisors (see below), whose sum is σ = 106408536. Its totient is φ = 53204264.

The previous prime is 79806371. The next prime is 79806413. The reversal of 79806399 is 99360897.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79806399 - 2¹³ = 79798207 is a prime.

It is a super-2 number, since 2×79806399² = 12738122642694402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79806599) 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, 13301064 + ... + 13301069.

It is an arithmetic number, because the mean of its divisors is an integer number (26602134).

Almost surely, 2^79806399 is an apocalyptic number.

79806399 is a deficient number, since it is larger than the sum of its proper divisors (26602137).

79806399 is a wasteful number, since it uses less digits than its factorization.

79806399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26602136.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 79806399 is about 8933.4427294297. The cubic root of 79806399 is about 430.5390733176.

The spelling of 79806399 in words is "seventy-nine million, eight hundred six thousand, three hundred ninety-nine".