13939815 has 16 divisors (see below), whose sum is σ = 22370400. Its totient is φ = 7412352.

The previous prime is 13939769. The next prime is 13939831. The reversal of 13939815 is 51893931.

It is not a de Polignac number, because 13939815 - 2¹¹ = 13937767 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 4641 + ... + 7029.

It is an arithmetic number, because the mean of its divisors is an integer number (1398150).

Almost surely, 2^13939815 is an apocalyptic number.

13939815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13939815 is a deficient number, since it is larger than the sum of its proper divisors (8430585).

13939815 is a wasteful number, since it uses less digits than its factorization.

13939815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786.

The product of its digits is 29160, while the sum is 39.

The square root of 13939815 is about 3733.6061656259. The cubic root of 13939815 is about 240.6683626805.

The spelling of 13939815 in words is "thirteen million, nine hundred thirty-nine thousand, eight hundred fifteen".