13920915 has 16 divisors (see below), whose sum is σ = 22353408. Its totient is φ = 7397856.

The previous prime is 13920913. The next prime is 13920923. The reversal of 13920915 is 51902931.

13920915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13920915 - 2¹ = 13920913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13920913) 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, 3094 + ... + 6116.

It is an arithmetic number, because the mean of its divisors is an integer number (1397088).

Almost surely, 2^13920915 is an apocalyptic number.

13920915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13920915 is a deficient number, since it is larger than the sum of its proper divisors (8432493).

13920915 is a wasteful number, since it uses less digits than its factorization.

13920915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 13920915 is about 3731.0742420917. The cubic root of 13920915 is about 240.5595451358.

The spelling of 13920915 in words is "thirteen million, nine hundred twenty thousand, nine hundred fifteen".