84408891 has 16 divisors (see below), whose sum is σ = 128753664. Its totient is φ = 48184704.

The previous prime is 84408869. The next prime is 84408911. The reversal of 84408891 is 19880448.

It is not a de Polignac number, because 84408891 - 2¹⁸ = 84146747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84408991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33715 + ... + 36131.

It is an arithmetic number, because the mean of its divisors is an integer number (8047104).

Almost surely, 2^84408891 is an apocalyptic number.

84408891 is a deficient number, since it is larger than the sum of its proper divisors (44344773).

84408891 is a wasteful number, since it uses less digits than its factorization.

84408891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 84408891 is about 9187.4311425991. The cubic root of 84408891 is about 438.6613775437.

The spelling of 84408891 in words is "eighty-four million, four hundred eight thousand, eight hundred ninety-one".