79440917 has 2 divisors, whose sum is σ = 79440918. Its totient is φ = 79440916.

The previous prime is 79440859. The next prime is 79440929. The reversal of 79440917 is 71904497.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41075281 + 38365636 = 6409^2 + 6194^2 .

It is a cyclic number.

It is not a de Polignac number, because 79440917 - 2⁸ = 79440661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79440967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39720458 + 39720459.

It is an arithmetic number, because the mean of its divisors is an integer number (39720459).

Almost surely, 2^79440917 is an apocalyptic number.

It is an amenable number.

79440917 is a deficient number, since it is larger than the sum of its proper divisors (1).

79440917 is an equidigital number, since it uses as much as digits as its factorization.

79440917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 79440917 is about 8912.9634241368. The cubic root of 79440917 is about 429.8808341140.

The spelling of 79440917 in words is "seventy-nine million, four hundred forty thousand, nine hundred seventeen".