86765921 has 4 divisors (see below), whose sum is σ = 94653744. Its totient is φ = 78878100.

The previous prime is 86765891. The next prime is 86765923. The reversal of 86765921 is 12956768.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86765921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86765923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3943895 + ... + 3943916.

It is an arithmetic number, because the mean of its divisors is an integer number (23663436).

Almost surely, 2^86765921 is an apocalyptic number.

It is an amenable number.

86765921 is a deficient number, since it is larger than the sum of its proper divisors (7887823).

86765921 is a wasteful number, since it uses less digits than its factorization.

86765921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7887822.

The product of its digits is 181440, while the sum is 44.

The square root of 86765921 is about 9314.8226499488. The cubic root of 86765921 is about 442.7070047670.

The spelling of 86765921 in words is "eighty-six million, seven hundred sixty-five thousand, nine hundred twenty-one".