13999965 has 32 divisors (see below), whose sum is σ = 25798656. Its totient is φ = 6350400.

The previous prime is 13999961. The next prime is 13999969. The reversal of 13999965 is 56999931.

It is an interprime number because it is at equal distance from previous prime (13999961) and next prime (13999969).

It is not a de Polignac number, because 13999965 - 2² = 13999961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15414 + ... + 16296.

It is an arithmetic number, because the mean of its divisors is an integer number (806208).

Almost surely, 2^13999965 is an apocalyptic number.

13999965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13999965 is a deficient number, since it is larger than the sum of its proper divisors (11798691).

13999965 is a wasteful number, since it uses less digits than its factorization.

13999965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049.

The product of its digits is 590490, while the sum is 51.

The square root of 13999965 is about 3741.6527096993. The cubic root of 13999965 is about 241.0140255722.

The spelling of 13999965 in words is "thirteen million, nine hundred ninety-nine thousand, nine hundred sixty-five".