86139621 has 24 divisors (see below), whose sum is σ = 128613056. Its totient is φ = 55520640.

The previous prime is 86139619. The next prime is 86139637. The reversal of 86139621 is 12693168.

It is not a de Polignac number, because 86139621 - 2¹ = 86139619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86139121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38781 + ... + 40941.

Almost surely, 2^86139621 is an apocalyptic number.

It is an amenable number.

86139621 is a deficient number, since it is larger than the sum of its proper divisors (42473435).

86139621 is a wasteful number, since it uses less digits than its factorization.

86139621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313 (or 2310 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 86139621 is about 9281.1433024170. The cubic root of 86139621 is about 441.6392383267.

The spelling of 86139621 in words is "eighty-six million, one hundred thirty-nine thousand, six hundred twenty-one".