18678818 has 16 divisors (see below), whose sum is σ = 30028320. Its totient is φ = 8682816.

The previous prime is 18678817. The next prime is 18678823. The reversal of 18678818 is 81887681.

It is not an unprimeable number, because it can be changed into a prime (18678817) 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, 488 + ... + 6131.

It is an arithmetic number, because the mean of its divisors is an integer number (1876770).

Almost surely, 2^18678818 is an apocalyptic number.

18678818 is a deficient number, since it is larger than the sum of its proper divisors (11349502).

18678818 is a wasteful number, since it uses less digits than its factorization.

18678818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6721.

The product of its digits is 172032, while the sum is 47.

The square root of 18678818 is about 4321.8998137393. The cubic root of 18678818 is about 265.3280285773.

The spelling of 18678818 in words is "eighteen million, six hundred seventy-eight thousand, eight hundred eighteen".