13875666 has 32 divisors (see below), whose sum is σ = 32576640. Its totient is φ = 3856896.

The previous prime is 13875661. The next prime is 13875677. The reversal of 13875666 is 66657831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (13875661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2911 + ... + 6018.

It is an arithmetic number, because the mean of its divisors is an integer number (1018020).

Almost surely, 2^13875666 is an apocalyptic number.

13875666 is an abundant number, since it is smaller than the sum of its proper divisors (18700974).

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

13875666 is a wasteful number, since it uses less digits than its factorization.

13875666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8978.

The product of its digits is 181440, while the sum is 42.

The square root of 13875666 is about 3725.0055033516. The cubic root of 13875666 is about 240.2986213402.

It can be divided in two parts, 13875 and 666, that added together give a palindrome (14541).

The spelling of 13875666 in words is "thirteen million, eight hundred seventy-five thousand, six hundred sixty-six".