13138816 has 16 divisors (see below), whose sum is σ = 26175240. Its totient is φ = 6569344.

The previous prime is 13138813. The next prime is 13138837. The reversal of 13138816 is 61883131.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13138813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51196 + ... + 51451.

Almost surely, 2^13138816 is an apocalyptic number.

13138816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13138816 is a deficient number, since it is larger than the sum of its proper divisors (13036424).

13138816 is an equidigital number, since it uses as much as digits as its factorization.

13138816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102661 (or 102649 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 13138816 is about 3624.7504741706. The cubic root of 13138816 is about 235.9674378133.

The spelling of 13138816 in words is "thirteen million, one hundred thirty-eight thousand, eight hundred sixteen".