864727021 has 4 divisors (see below), whose sum is σ = 902323872. Its totient is φ = 827130172.

The previous prime is 864727001. The next prime is 864727109. The reversal of 864727021 is 120727468.

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 not a de Polignac number, because 864727021 - 2⁷ = 864726893 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 (864727001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18798391 + ... + 18798436.

It is an arithmetic number, because the mean of its divisors is an integer number (225580968).

Almost surely, 2^864727021 is an apocalyptic number.

It is an amenable number.

864727021 is a deficient number, since it is larger than the sum of its proper divisors (37596851).

864727021 is a wasteful number, since it uses less digits than its factorization.

864727021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37596850.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 864727021 is about 29406.2411912845. The cubic root of 864727021 is about 952.7077030210.

The spelling of 864727021 in words is "eight hundred sixty-four million, seven hundred twenty-seven thousand, twenty-one".