84864979 has 2 divisors, whose sum is σ = 84864980. Its totient is φ = 84864978.

The previous prime is 84864973. The next prime is 84865007. The reversal of 84864979 is 97946848.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84864979 - 2⁷ = 84864851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84864973) 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 as a sum of consecutive naturals, namely, 42432489 + 42432490.

It is an arithmetic number, because the mean of its divisors is an integer number (42432490).

Almost surely, 2^84864979 is an apocalyptic number.

84864979 is a deficient number, since it is larger than the sum of its proper divisors (1).

84864979 is an equidigital number, since it uses as much as digits as its factorization.

84864979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The square root of 84864979 is about 9212.2190052126. The cubic root of 84864979 is about 439.4500342909.

The spelling of 84864979 in words is "eighty-four million, eight hundred sixty-four thousand, nine hundred seventy-nine".