13665242 has 4 divisors (see below), whose sum is σ = 20497866. Its totient is φ = 6832620.

The previous prime is 13665163. The next prime is 13665257. The reversal of 13665242 is 24256631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24256631 = 7 ⋅3465233.

It can be written as a sum of positive squares in only one way, i.e., 8462281 + 5202961 = 2909^2 + 2281^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3416309 + ... + 3416312.

Almost surely, 2^13665242 is an apocalyptic number.

13665242 is a deficient number, since it is larger than the sum of its proper divisors (6832624).

13665242 is an equidigital number, since it uses as much as digits as its factorization.

13665242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6832623.

The product of its digits is 8640, while the sum is 29.

The square root of 13665242 is about 3696.6528103137. The cubic root of 13665242 is about 239.0777219607.

The spelling of 13665242 in words is "thirteen million, six hundred sixty-five thousand, two hundred forty-two".