13961665 has 4 divisors (see below), whose sum is σ = 16754004. Its totient is φ = 11169328.

The previous prime is 13961657. The next prime is 13961671. The reversal of 13961665 is 56616931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5253264 + 8708401 = 2292^2 + 2951^2 .

It is a cyclic number.

It is not a de Polignac number, because 13961665 - 2³ = 13961657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1396162 + ... + 1396171.

It is an arithmetic number, because the mean of its divisors is an integer number (4188501).

Almost surely, 2^13961665 is an apocalyptic number.

It is an amenable number.

13961665 is a deficient number, since it is larger than the sum of its proper divisors (2792339).

13961665 is an equidigital number, since it uses as much as digits as its factorization.

13961665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792338.

The product of its digits is 29160, while the sum is 37.

The square root of 13961665 is about 3736.5311453272. The cubic root of 13961665 is about 240.7940424588.

The spelling of 13961665 in words is "thirteen million, nine hundred sixty-one thousand, six hundred sixty-five".