18681386 has 16 divisors (see below), whose sum is σ = 28531008. Its totient is φ = 9172800.

The previous prime is 18681373. The next prime is 18681431. The reversal of 18681386 is 68318681.

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 7 ways as a sum of consecutive naturals, for example, 29291 + ... + 29921.

It is an arithmetic number, because the mean of its divisors is an integer number (1783188).

Almost surely, 2^18681386 is an apocalyptic number.

18681386 is a deficient number, since it is larger than the sum of its proper divisors (9849622).

18681386 is a wasteful number, since it uses less digits than its factorization.

18681386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877.

The product of its digits is 55296, while the sum is 41.

The square root of 18681386 is about 4322.1968950986. The cubic root of 18681386 is about 265.3401872902.

The spelling of 18681386 in words is "eighteen million, six hundred eighty-one thousand, three hundred eighty-six".