939393021 has 32 divisors (see below), whose sum is σ = 1530724608. Its totient is φ = 500198400.

The previous prime is 939393019. The next prime is 939393023. The reversal of 939393021 is 120393939.

It is an interprime number because it is at equal distance from previous prime (939393019) and next prime (939393023).

It is not a de Polignac number, because 939393021 - 2¹ = 939393019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (939393023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23031 + ... + 49083.

It is an arithmetic number, because the mean of its divisors is an integer number (47835144).

Almost surely, 2^939393021 is an apocalyptic number.

It is an amenable number.

939393021 is a deficient number, since it is larger than the sum of its proper divisors (591331587).

939393021 is a wasteful number, since it uses less digits than its factorization.

939393021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26181.

The product of its (nonzero) digits is 39366, while the sum is 39.

The square root of 939393021 is about 30649.5190990006. The cubic root of 939393021 is about 979.3752164382.

The spelling of 939393021 in words is "nine hundred thirty-nine million, three hundred ninety-three thousand, twenty-one".