13665431 has 8 divisors (see below), whose sum is σ = 14809200. Its totient is φ = 12534912.

The previous prime is 13665413. The next prime is 13665481. The reversal of 13665431 is 13456631.

It is a happy number.

13665431 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13665431 - 2⁶ = 13665367 is a prime.

It is a super-2 number, since 2×13665431² = 373488008831522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13665394 and 13665403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106 + ... + 5343.

It is an arithmetic number, because the mean of its divisors is an integer number (1851150).

Almost surely, 2^13665431 is an apocalyptic number.

13665431 is a deficient number, since it is larger than the sum of its proper divisors (1143769).

13665431 is a wasteful number, since it uses less digits than its factorization.

13665431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6625.

The product of its digits is 6480, while the sum is 29.

The square root of 13665431 is about 3696.6783738919. The cubic root of 13665431 is about 239.0788241605.

The spelling of 13665431 in words is "thirteen million, six hundred sixty-five thousand, four hundred thirty-one".