13909816 has 8 divisors (see below), whose sum is σ = 26080920. Its totient is φ = 6954904.

The previous prime is 13909813. The next prime is 13909829. The reversal of 13909816 is 61890931.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13909813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 869356 + ... + 869371.

It is an arithmetic number, because the mean of its divisors is an integer number (3260115).

Almost surely, 2^13909816 is an apocalyptic number.

It is an amenable number.

13909816 is a deficient number, since it is larger than the sum of its proper divisors (12171104).

13909816 is a wasteful number, since it uses less digits than its factorization.

13909816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738733 (or 1738729 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 13909816 is about 3729.5865722624. The cubic root of 13909816 is about 240.4955962674.

The spelling of 13909816 in words is "thirteen million, nine hundred nine thousand, eight hundred sixteen".