13388666 has 4 divisors (see below), whose sum is σ = 20083002. Its totient is φ = 6694332.

The previous prime is 13388659. The next prime is 13388671. The reversal of 13388666 is 66688331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66688331 = 17 ⋅3922843.

It can be written as a sum of positive squares in only one way, i.e., 6911641 + 6477025 = 2629^2 + 2545^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3347165 + ... + 3347168.

Almost surely, 2^13388666 is an apocalyptic number.

13388666 is a deficient number, since it is larger than the sum of its proper divisors (6694336).

13388666 is an equidigital number, since it uses as much as digits as its factorization.

13388666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6694335.

The product of its digits is 124416, while the sum is 41.

The square root of 13388666 is about 3659.0526096245. The cubic root of 13388666 is about 237.4537882388.

The spelling of 13388666 in words is "thirteen million, three hundred eighty-eight thousand, six hundred sixty-six".