84279639 has 8 divisors (see below), whose sum is σ = 113062912. Its totient is φ = 55841400.

The previous prime is 84279631. The next prime is 84279653. The reversal of 84279639 is 93697248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84279639 - 2³ = 84279631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84279631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85687 + ... + 86664.

It is an arithmetic number, because the mean of its divisors is an integer number (14132864).

Almost surely, 2^84279639 is an apocalyptic number.

84279639 is a deficient number, since it is larger than the sum of its proper divisors (28783273).

84279639 is a wasteful number, since it uses less digits than its factorization.

84279639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172517.

The product of its digits is 653184, while the sum is 48.

The square root of 84279639 is about 9180.3942725789. The cubic root of 84279639 is about 438.4373615502.

The spelling of 84279639 in words is "eighty-four million, two hundred seventy-nine thousand, six hundred thirty-nine".