86972391 has 48 divisors (see below), whose sum is σ = 149879808. Its totient is φ = 47980800.

The previous prime is 86972387. The next prime is 86972401. The reversal of 86972391 is 19327968.

It is not a de Polignac number, because 86972391 - 2² = 86972387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86972381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51340 + ... + 53006.

It is an arithmetic number, because the mean of its divisors is an integer number (3122496).

Almost surely, 2^86972391 is an apocalyptic number.

86972391 is a deficient number, since it is larger than the sum of its proper divisors (62907417).

86972391 is a wasteful number, since it uses less digits than its factorization.

86972391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732 (or 1729 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 86972391 is about 9325.8989379041. The cubic root of 86972391 is about 443.0578848755.

The spelling of 86972391 in words is "eighty-six million, nine hundred seventy-two thousand, three hundred ninety-one".