13966815 has 16 divisors (see below), whose sum is σ = 22464000. Its totient is φ = 7409952.

The previous prime is 13966811. The next prime is 13966829. The reversal of 13966815 is 51866931.

It is not a de Polignac number, because 13966815 - 2² = 13966811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13966811) 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, 646 + ... + 5324.

It is an arithmetic number, because the mean of its divisors is an integer number (1404000).

Almost surely, 2^13966815 is an apocalyptic number.

13966815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13966815 is a deficient number, since it is larger than the sum of its proper divisors (8497185).

13966815 is a wasteful number, since it uses less digits than its factorization.

13966815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4886.

The product of its digits is 38880, while the sum is 39.

The square root of 13966815 is about 3737.2202236422. The cubic root of 13966815 is about 240.8236458257.

The spelling of 13966815 in words is "thirteen million, nine hundred sixty-six thousand, eight hundred fifteen".