18690386 has 36 divisors (see below), whose sum is σ = 33441786. Its totient is φ = 7824960.

The previous prime is 18690377. The next prime is 18690391. The reversal of 18690386 is 68309681.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13097161 + 5593225 = 3619^2 + 2365^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40670 + ... + 41126.

Almost surely, 2^18690386 is an apocalyptic number.

18690386 is a deficient number, since it is larger than the sum of its proper divisors (14751400).

18690386 is a wasteful number, since it uses less digits than its factorization.

18690386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18690386 is about 4323.2379069397. The cubic root of 18690386 is about 265.3827908082.

The spelling of 18690386 in words is "eighteen million, six hundred ninety thousand, three hundred eighty-six".