939721 has 4 divisors (see below), whose sum is σ = 989200. Its totient is φ = 890244.

The previous prime is 939713. The next prime is 939737. The reversal of 939721 is 127939.

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 939721 - 2³ = 939713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (939791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24711 + ... + 24748.

It is an arithmetic number, because the mean of its divisors is an integer number (247300).

2⁹³⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

939721 is a deficient number, since it is larger than the sum of its proper divisors (49479).

939721 is a wasteful number, since it uses less digits than its factorization.

939721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49478.

The product of its digits is 3402, while the sum is 31.

The square root of 939721 is about 969.3920775414. The cubic root of 939721 is about 97.9489182627.

The spelling of 939721 in words is "nine hundred thirty-nine thousand, seven hundred twenty-one".