13709904 has 80 divisors (see below), whose sum is σ = 38664192. Its totient is φ = 4161024.

The previous prime is 13709903. The next prime is 13709921. The reversal of 13709904 is 40990731.

It is a super-2 number, since 2×13709904² = 375922935378432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13709903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79162 + ... + 79334.

Almost surely, 2^13709904 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 13709904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19332096).

13709904 is an abundant number, since it is smaller than the sum of its proper divisors (24954288).

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

13709904 is a wasteful number, since it uses less digits than its factorization.

13709904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 13709904 is about 3702.6887527849. The cubic root of 13709904 is about 239.3378973188.

The spelling of 13709904 in words is "thirteen million, seven hundred nine thousand, nine hundred four".