79840365 has 32 divisors (see below), whose sum is σ = 140213376. Its totient is φ = 38472960.

The previous prime is 79840361. The next prime is 79840421. The reversal of 79840365 is 56304897.

It is a happy number.

It is not a de Polignac number, because 79840365 - 2² = 79840361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79840361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27147 + ... + 29943.

It is an arithmetic number, because the mean of its divisors is an integer number (4381668).

Almost surely, 2^79840365 is an apocalyptic number.

It is an amenable number.

79840365 is a deficient number, since it is larger than the sum of its proper divisors (60373011).

79840365 is a wasteful number, since it uses less digits than its factorization.

79840365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 79840365 is about 8935.3435860072. The cubic root of 79840365 is about 430.6001445108.

The spelling of 79840365 in words is "seventy-nine million, eight hundred forty thousand, three hundred sixty-five".