84238739 has 4 divisors (see below), whose sum is σ = 90718656. Its totient is φ = 77758824.

The previous prime is 84238733. The next prime is 84238769. The reversal of 84238739 is 93783248.

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

It is a de Polignac number, because none of the positive numbers 2^k-84238739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84238739.

It is not an unprimeable number, because it can be changed into a prime (84238733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3239939 + ... + 3239964.

It is an arithmetic number, because the mean of its divisors is an integer number (22679664).

Almost surely, 2^84238739 is an apocalyptic number.

84238739 is a deficient number, since it is larger than the sum of its proper divisors (6479917).

84238739 is a wasteful number, since it uses less digits than its factorization.

84238739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6479916.

The product of its digits is 290304, while the sum is 44.

The square root of 84238739 is about 9178.1664290859. The cubic root of 84238739 is about 438.3664270997.

The spelling of 84238739 in words is "eighty-four million, two hundred thirty-eight thousand, seven hundred thirty-nine".