84913921 has 16 divisors (see below), whose sum is σ = 88732800. Its totient is φ = 81214848.

The previous prime is 84913919. The next prime is 84913931. The reversal of 84913921 is 12931948.

It is a cyclic number.

It is not a de Polignac number, because 84913921 - 2¹ = 84913919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84913931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540775 + ... + 540931.

It is an arithmetic number, because the mean of its divisors is an integer number (5545800).

Almost surely, 2^84913921 is an apocalyptic number.

It is an amenable number.

84913921 is a deficient number, since it is larger than the sum of its proper divisors (3818879).

84913921 is a wasteful number, since it uses less digits than its factorization.

84913921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its digits is 15552, while the sum is 37.

The square root of 84913921 is about 9214.8749855872. The cubic root of 84913921 is about 439.5344956343.

The spelling of 84913921 in words is "eighty-four million, nine hundred thirteen thousand, nine hundred twenty-one".