84697979 has 4 divisors (see below), whose sum is σ = 84881376. Its totient is φ = 84514584.

The previous prime is 84697973. The next prime is 84697993. The reversal of 84697979 is 97979648.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84697979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84697973) 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, 91004 + ... + 91929.

It is an arithmetic number, because the mean of its divisors is an integer number (21220344).

Almost surely, 2^84697979 is an apocalyptic number.

84697979 is a deficient number, since it is larger than the sum of its proper divisors (183397).

84697979 is a wasteful number, since it uses less digits than its factorization.

84697979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183396.

The product of its digits is 6858432, while the sum is 59.

The square root of 84697979 is about 9203.1504931735. The cubic root of 84697979 is about 439.1615904286.

The spelling of 84697979 in words is "eighty-four million, six hundred ninety-seven thousand, nine hundred seventy-nine".