13665240 has 64 divisors (see below), whose sum is σ = 45554400. Its totient is φ = 3643776.

The previous prime is 13665163. The next prime is 13665257. The reversal of 13665240 is 4256631.

13665240 is a `hidden beast` number, since 1 + 3 + 6 + 652 + 4 + 0 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5247 + ... + 7406.

Almost surely, 2^13665240 is an apocalyptic number.

13665240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13665240 is an abundant number, since it is smaller than the sum of its proper divisors (31889160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13665240 is a wasteful number, since it uses less digits than its factorization.

13665240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12673 (or 12663 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 13665240 is about 3696.6525397987. The cubic root of 13665240 is about 239.0777102971.

The spelling of 13665240 in words is "thirteen million, six hundred sixty-five thousand, two hundred forty".