13668646 has 16 divisors (see below), whose sum is σ = 21831984. Its totient is φ = 6395904.

The previous prime is 13668637. The next prime is 13668653. The reversal of 13668646 is 64686631.

It is a junction number, because it is equal to n+sod(n) for n = 13668599 and 13668608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5521 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (1364499).

Almost surely, 2^13668646 is an apocalyptic number.

13668646 is a deficient number, since it is larger than the sum of its proper divisors (8163338).

13668646 is a wasteful number, since it uses less digits than its factorization.

13668646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295.

The product of its digits is 124416, while the sum is 40.

The square root of 13668646 is about 3697.1131981588. The cubic root of 13668646 is about 239.0975716640.

Subtracting from 13668646 its sum of digits (40), we obtain a triangular number (13668606 = T₅₂₂₈).

The spelling of 13668646 in words is "thirteen million, six hundred sixty-eight thousand, six hundred forty-six".