84639408 has 40 divisors (see below), whose sum is σ = 249888768. Its totient is φ = 24182592.

The previous prime is 84639389. The next prime is 84639419. The reversal of 84639408 is 80493648.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 84639408.

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, 125616 + ... + 126287.

Almost surely, 2^84639408 is an apocalyptic number.

It is an amenable number.

84639408 is an abundant number, since it is smaller than the sum of its proper divisors (165249360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84639408 is a wasteful number, since it uses less digits than its factorization.

84639408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251921 (or 251915 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 84639408 is about 9199.9678260307. The cubic root of 84639408 is about 439.0603362811.

Subtracting from 84639408 its reverse (80493648), we obtain a triangular number (4145760 = T₂₈₇₉).

It can be divided in two parts, 8463 and 9408, that added together give a palindrome (17871).

The spelling of 84639408 in words is "eighty-four million, six hundred thirty-nine thousand, four hundred eight".