18666942 has 24 divisors (see below), whose sum is σ = 43429896. Its totient is φ = 5333328.

The previous prime is 18666941. The next prime is 18666983. The reversal of 18666942 is 24966681.

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

It is a junction number, because it is equal to n+sod(n) for n = 18666894 and 18666903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18666941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31453 + ... + 32040.

It is an arithmetic number, because the mean of its divisors is an integer number (1809579).

Almost surely, 2^18666942 is an apocalyptic number.

18666942 is an abundant number, since it is smaller than the sum of its proper divisors (24762954).

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

18666942 is a wasteful number, since it uses less digits than its factorization.

18666942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63512 (or 63505 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 18666942 is about 4320.5256624628. The cubic root of 18666942 is about 265.2717847665.

The spelling of 18666942 in words is "eighteen million, six hundred sixty-six thousand, nine hundred forty-two".