79690397 has 4 divisors (see below), whose sum is σ = 80038620. Its totient is φ = 79342176.

The previous prime is 79690363. The next prime is 79690399. The reversal of 79690397 is 79309697.

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: 79309697 = 2957 ⋅26821.

It can be written as a sum of positive squares in 2 ways, for example, as 50324836 + 29365561 = 7094^2 + 5419^2 .

It is a cyclic number.

It is not a de Polignac number, because 79690397 - 2⁸ = 79690141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79690399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173768 + ... + 174225.

It is an arithmetic number, because the mean of its divisors is an integer number (20009655).

Almost surely, 2^79690397 is an apocalyptic number.

It is an amenable number.

79690397 is a deficient number, since it is larger than the sum of its proper divisors (348223).

79690397 is a wasteful number, since it uses less digits than its factorization.

79690397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348222.

The product of its (nonzero) digits is 642978, while the sum is 50.

The square root of 79690397 is about 8926.9477986600. The cubic root of 79690397 is about 430.3303698717.

The spelling of 79690397 in words is "seventy-nine million, six hundred ninety thousand, three hundred ninety-seven".