864373021 has 8 divisors (see below), whose sum is σ = 889316280. Its totient is φ = 839513088.

The previous prime is 864373019. The next prime is 864373067. The reversal of 864373021 is 120373468.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 34644996 + 829728025 = 5886^2 + 28805^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 864373021 - 2¹ = 864373019 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 (864373121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525 + ... + 41581.

It is an arithmetic number, because the mean of its divisors is an integer number (111164535).

Almost surely, 2^864373021 is an apocalyptic number.

It is an amenable number.

864373021 is a deficient number, since it is larger than the sum of its proper divisors (24943259).

864373021 is a wasteful number, since it uses less digits than its factorization.

864373021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41663.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 864373021 is about 29400.2214447443. The cubic root of 864373021 is about 952.5776794987.

The spelling of 864373021 in words is "eight hundred sixty-four million, three hundred seventy-three thousand, twenty-one".