939494021 has 16 divisors (see below), whose sum is σ = 963532800. Its totient is φ = 915883200.

The previous prime is 939493937. The next prime is 939494093. The reversal of 939494021 is 120494939.

It is a cyclic number.

It is not a de Polignac number, because 939494021 - 2¹⁸ = 939231877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 939494021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (939494821) 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 15 ways as a sum of consecutive naturals, for example, 2452796 + ... + 2453178.

It is an arithmetic number, because the mean of its divisors is an integer number (60220800).

Almost surely, 2^939494021 is an apocalyptic number.

It is an amenable number.

939494021 is a deficient number, since it is larger than the sum of its proper divisors (24038779).

939494021 is a wasteful number, since it uses less digits than its factorization.

939494021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 939494021 is about 30651.1667151513. The cubic root of 939494021 is about 979.4103147587.

The spelling of 939494021 in words is "nine hundred thirty-nine million, four hundred ninety-four thousand, twenty-one".