84242139 has 16 divisors (see below), whose sum is σ = 114301440. Its totient is φ = 55177920.

The previous prime is 84242113. The next prime is 84242141. The reversal of 84242139 is 93124248.

It is not a de Polignac number, because 84242139 - 2⁵ = 84242107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84242539) 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, 86634 + ... + 87600.

It is an arithmetic number, because the mean of its divisors is an integer number (7143840).

Almost surely, 2^84242139 is an apocalyptic number.

84242139 is a deficient number, since it is larger than the sum of its proper divisors (30059301).

84242139 is a wasteful number, since it uses less digits than its factorization.

84242139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450.

The product of its digits is 13824, while the sum is 33.

The square root of 84242139 is about 9178.3516493976. The cubic root of 84242139 is about 438.3723247260.

The spelling of 84242139 in words is "eighty-four million, two hundred forty-two thousand, one hundred thirty-nine".