84979391 has 4 divisors (see below), whose sum is σ = 97119312. Its totient is φ = 72839472.

The previous prime is 84979387. The next prime is 84979397. The reversal of 84979391 is 19397948.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84979391 - 2² = 84979387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84979397) 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, 6069950 + ... + 6069963.

It is an arithmetic number, because the mean of its divisors is an integer number (24279828).

Almost surely, 2^84979391 is an apocalyptic number.

84979391 is a deficient number, since it is larger than the sum of its proper divisors (12139921).

84979391 is a wasteful number, since it uses less digits than its factorization.

84979391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12139920.

The product of its digits is 489888, while the sum is 50.

The square root of 84979391 is about 9218.4267095855. The cubic root of 84979391 is about 439.6474293385.

The spelling of 84979391 in words is "eighty-four million, nine hundred seventy-nine thousand, three hundred ninety-one".