939904 has 32 divisors (see below), whose sum is σ = 2142000. Its totient is φ = 402432.

The previous prime is 939901. The next prime is 939923. The reversal of 939904 is 409939.

939904 is nontrivially palindromic in base 3.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 939904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (939901) 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, 372 + ... + 1420.

2⁹³⁹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 939904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071000).

939904 is an abundant number, since it is smaller than the sum of its proper divisors (1202096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

939904 is a wasteful number, since it uses less digits than its factorization.

939904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 939904 is about 969.4864619993. The cubic root of 939904 is about 97.9552759968.

The spelling of 939904 in words is "nine hundred thirty-nine thousand, nine hundred four".