84971239 has 4 divisors (see below), whose sum is σ = 85059720. Its totient is φ = 84882760.

The previous prime is 84971233. The next prime is 84971267. The reversal of 84971239 is 93217948.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84971239 - 2⁵ = 84971207 is a prime.

It is a super-2 number, since 2×84971239² = 14440222914390242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84971195 and 84971204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84971233) 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 3 ways as a sum of consecutive naturals, for example, 42784 + ... + 44725.

It is an arithmetic number, because the mean of its divisors is an integer number (21264930).

Almost surely, 2^84971239 is an apocalyptic number.

84971239 is a deficient number, since it is larger than the sum of its proper divisors (88481).

84971239 is an equidigital number, since it uses as much as digits as its factorization.

84971239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88480.

The product of its digits is 108864, while the sum is 43.

The square root of 84971239 is about 9217.9845411022. The cubic root of 84971239 is about 439.6333705555.

The spelling of 84971239 in words is "eighty-four million, nine hundred seventy-one thousand, two hundred thirty-nine".