84390812 has 24 divisors (see below), whose sum is σ = 166667760. Its totient is φ = 37036160.

The previous prime is 84390809. The next prime is 84390857. The reversal of 84390812 is 21809348.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31793 + ... + 34344.

It is an arithmetic number, because the mean of its divisors is an integer number (6944490).

Almost surely, 2^84390812 is an apocalyptic number.

It is an amenable number.

84390812 is a deficient number, since it is larger than the sum of its proper divisors (82276948).

84390812 is a wasteful number, since it uses less digits than its factorization.

84390812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66181 (or 66179 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 84390812 is about 9186.4471913793. The cubic root of 84390812 is about 438.6300572834.

The spelling of 84390812 in words is "eighty-four million, three hundred ninety thousand, eight hundred twelve".