18686946 has 16 divisors (see below), whose sum is σ = 37425600. Its totient is φ = 6220368.

The previous prime is 18686911. The next prime is 18686947. The reversal of 18686946 is 64968681.

It is a junction number, because it is equal to n+sod(n) for n = 18686895 and 18686904.

It is not an unprimeable number, because it can be changed into a prime (18686947) 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, 3820 + ... + 7208.

It is an arithmetic number, because the mean of its divisors is an integer number (2339100).

Almost surely, 2^18686946 is an apocalyptic number.

18686946 is an abundant number, since it is smaller than the sum of its proper divisors (18738654).

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

18686946 is a wasteful number, since it uses less digits than its factorization.

18686946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313.

The product of its digits is 497664, while the sum is 48.

The square root of 18686946 is about 4322.8400386783. The cubic root of 18686946 is about 265.3665084119.

The spelling of 18686946 in words is "eighteen million, six hundred eighty-six thousand, nine hundred forty-six".