13731915 has 16 divisors (see below), whose sum is σ = 22680576. Its totient is φ = 7087200.

The previous prime is 13731901. The next prime is 13731917. The reversal of 13731915 is 51913731.

It is a happy number.

It is not a de Polignac number, because 13731915 - 2⁸ = 13731659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13731917) 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, 14301 + ... + 15230.

It is an arithmetic number, because the mean of its divisors is an integer number (1417536).

Almost surely, 2^13731915 is an apocalyptic number.

13731915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13731915 is a deficient number, since it is larger than the sum of its proper divisors (8948661).

13731915 is a wasteful number, since it uses less digits than its factorization.

13731915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29570.

The product of its digits is 2835, while the sum is 30.

The square root of 13731915 is about 3705.6598602678. The cubic root of 13731915 is about 239.4659130391.

The spelling of 13731915 in words is "thirteen million, seven hundred thirty-one thousand, nine hundred fifteen".