13928815 has 4 divisors (see below), whose sum is σ = 16714584. Its totient is φ = 11143048.

The previous prime is 13928791. The next prime is 13928833. The reversal of 13928815 is 51882931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51882931 = 277 ⋅187303.

It is a cyclic number.

It is not a de Polignac number, because 13928815 - 2²¹ = 11831663 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1392877 + ... + 1392886.

It is an arithmetic number, because the mean of its divisors is an integer number (4178646).

Almost surely, 2^13928815 is an apocalyptic number.

13928815 is a deficient number, since it is larger than the sum of its proper divisors (2785769).

13928815 is an equidigital number, since it uses as much as digits as its factorization.

13928815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785768.

The product of its digits is 17280, while the sum is 37.

The square root of 13928815 is about 3732.1327682707. The cubic root of 13928815 is about 240.6050416909.

The spelling of 13928815 in words is "thirteen million, nine hundred twenty-eight thousand, eight hundred fifteen".