79406991 has 12 divisors (see below), whose sum is σ = 116271168. Its totient is φ = 52212384.

The previous prime is 79406963. The next prime is 79407001. The reversal of 79406991 is 19960497.

It is not a de Polignac number, because 79406991 - 2⁷ = 79406863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79406891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59775 + ... + 61088.

It is an arithmetic number, because the mean of its divisors is an integer number (9689264).

Almost surely, 2^79406991 is an apocalyptic number.

79406991 is a deficient number, since it is larger than the sum of its proper divisors (36864177).

79406991 is a wasteful number, since it uses less digits than its factorization.

79406991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120942 (or 120939 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 79406991 is about 8911.0600379528. The cubic root of 79406991 is about 429.8196304995.

The spelling of 79406991 in words is "seventy-nine million, four hundred six thousand, nine hundred ninety-one".