79940869 has 4 divisors (see below), whose sum is σ = 80904096. Its totient is φ = 78977644.

The previous prime is 79940867. The next prime is 79940873. The reversal of 79940869 is 96804997.

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: 96804997 = 43 ⋅2251279.

It is a cyclic number.

It is not a de Polignac number, because 79940869 - 2¹ = 79940867 is a prime.

It is a super-2 number, since 2×79940869² = 12781085072950322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79940867) 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, 481489 + ... + 481654.

It is an arithmetic number, because the mean of its divisors is an integer number (20226024).

Almost surely, 2^79940869 is an apocalyptic number.

It is an amenable number.

79940869 is a deficient number, since it is larger than the sum of its proper divisors (963227).

79940869 is an equidigital number, since it uses as much as digits as its factorization.

79940869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963226.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 79940869 is about 8940.9657755748. The cubic root of 79940869 is about 430.7807502749.

The spelling of 79940869 in words is "seventy-nine million, nine hundred forty thousand, eight hundred sixty-nine".