939640321 has 4 divisors (see below), whose sum is σ = 980494272. Its totient is φ = 898786372.

The previous prime is 939640319. The next prime is 939640391. The reversal of 939640321 is 123046939.

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 939640321 - 2¹ = 939640319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (939640301) 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, 20426941 + ... + 20426986.

It is an arithmetic number, because the mean of its divisors is an integer number (245123568).

Almost surely, 2^939640321 is an apocalyptic number.

It is an amenable number.

939640321 is a deficient number, since it is larger than the sum of its proper divisors (40853951).

939640321 is a wasteful number, since it uses less digits than its factorization.

939640321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40853950.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 939640321 is about 30653.5531545692. The cubic root of 939640321 is about 979.4611507366.

The spelling of 939640321 in words is "nine hundred thirty-nine million, six hundred forty thousand, three hundred twenty-one".