84557839 has 4 divisors (see below), whose sum is σ = 86843224. Its totient is φ = 82272456.

The previous prime is 84557761. The next prime is 84557861. The reversal of 84557839 is 93875548.

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 84557839 - 2²¹ = 82460687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84557792 and 84557801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84557899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142637 + ... + 1142710.

It is an arithmetic number, because the mean of its divisors is an integer number (21710806).

Almost surely, 2^84557839 is an apocalyptic number.

84557839 is a deficient number, since it is larger than the sum of its proper divisors (2285385).

84557839 is a wasteful number, since it uses less digits than its factorization.

84557839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285384.

The product of its digits is 1209600, while the sum is 49.

The square root of 84557839 is about 9195.5336441122. The cubic root of 84557839 is about 438.9192466696.

The spelling of 84557839 in words is "eighty-four million, five hundred fifty-seven thousand, eight hundred thirty-nine".