79869797 has 4 divisors (see below), whose sum is σ = 91279776. Its totient is φ = 68459820.

The previous prime is 79869793. The next prime is 79869809. The reversal of 79869797 is 79796897.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79796897 = 5701 ⋅13997.

It is a cyclic number.

It is not a de Polignac number, because 79869797 - 2² = 79869793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79869793) 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, 5704979 + ... + 5704992.

It is an arithmetic number, because the mean of its divisors is an integer number (22819944).

Almost surely, 2^79869797 is an apocalyptic number.

It is an amenable number.

79869797 is a deficient number, since it is larger than the sum of its proper divisors (11409979).

79869797 is a wasteful number, since it uses less digits than its factorization.

79869797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11409978.

The product of its digits is 12002256, while the sum is 62.

The square root of 79869797 is about 8936.9903770789. The cubic root of 79869797 is about 430.6530495231.

Subtracting from 79869797 its reverse (79796897), we obtain a square (72900 = 270²).

The spelling of 79869797 in words is "seventy-nine million, eight hundred sixty-nine thousand, seven hundred ninety-seven".