939328021 has 4 divisors (see below), whose sum is σ = 941064844. Its totient is φ = 937591200.

The previous prime is 939327997. The next prime is 939328031. The reversal of 939328021 is 120823939.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 716900625 + 222427396 = 26775^2 + 14914^2 .

It is a cyclic number.

It is not a de Polignac number, because 939328021 - 2⁵ = 939327989 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 (939328031) 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, 867600 + ... + 868681.

It is an arithmetic number, because the mean of its divisors is an integer number (235266211).

Almost surely, 2^939328021 is an apocalyptic number.

It is an amenable number.

939328021 is a deficient number, since it is larger than the sum of its proper divisors (1736823).

939328021 is a wasteful number, since it uses less digits than its factorization.

939328021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736822.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 939328021 is about 30648.4587051290. The cubic root of 939328021 is about 979.3526270796.

The spelling of 939328021 in words is "nine hundred thirty-nine million, three hundred twenty-eight thousand, twenty-one".