18186742 has 24 divisors (see below), whose sum is σ = 31970160. Its totient is φ = 7736400.

The previous prime is 18186737. The next prime is 18186757. The reversal of 18186742 is 24768181.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14184 + ... + 15412.

It is an arithmetic number, because the mean of its divisors is an integer number (1332090).

Almost surely, 2^18186742 is an apocalyptic number.

18186742 is a deficient number, since it is larger than the sum of its proper divisors (13783418).

18186742 is a wasteful number, since it uses less digits than its factorization.

18186742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396 (or 1389 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 18186742 is about 4264.5916568881. The cubic root of 18186742 is about 262.9773241110.

The spelling of 18186742 in words is "eighteen million, one hundred eighty-six thousand, seven hundred forty-two".