16939904 has 32 divisors (see below), whose sum is σ = 34149600. Its totient is φ = 8369152.

The previous prime is 16939889. The next prime is 16939907. The reversal of 16939904 is 40993961.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16939907) 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, 10649 + ... + 12135.

It is an arithmetic number, because the mean of its divisors is an integer number (1067175).

Almost surely, 2^16939904 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 16939904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17074800).

16939904 is an abundant number, since it is smaller than the sum of its proper divisors (17209696).

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

16939904 is an equidigital number, since it uses as much as digits as its factorization.

16939904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590 (or 1578 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 16939904 is about 4115.8114631261. The cubic root of 16939904 is about 256.8248136140.

The spelling of 16939904 in words is "sixteen million, nine hundred thirty-nine thousand, nine hundred four".