86921538 has 32 divisors (see below), whose sum is σ = 192255552. Its totient is φ = 25977600.

The previous prime is 86921519. The next prime is 86921539. The reversal of 86921538 is 83512968.

It is a self number, because there is not a number n which added to its sum of digits gives 86921538.

It is not an unprimeable number, because it can be changed into a prime (86921539) 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 15 ways as a sum of consecutive naturals, for example, 4203 + ... + 13838.

It is an arithmetic number, because the mean of its divisors is an integer number (6007986).

Almost surely, 2^86921538 is an apocalyptic number.

86921538 is an abundant number, since it is smaller than the sum of its proper divisors (105334014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86921538 is a wasteful number, since it uses less digits than its factorization.

86921538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18130.

The product of its digits is 103680, while the sum is 42.

The square root of 86921538 is about 9323.1720996665. The cubic root of 86921538 is about 442.9715156455.

The spelling of 86921538 in words is "eighty-six million, nine hundred twenty-one thousand, five hundred thirty-eight".