18699818 has 8 divisors (see below), whose sum is σ = 28069248. Its totient is φ = 9343404.

The previous prime is 18699803. The next prime is 18699823. The reversal of 18699818 is 81899681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2105 + ... + 6467.

It is an arithmetic number, because the mean of its divisors is an integer number (3508656).

Almost surely, 2^18699818 is an apocalyptic number.

18699818 is a deficient number, since it is larger than the sum of its proper divisors (9369430).

18699818 is a wasteful number, since it uses less digits than its factorization.

18699818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6508.

The product of its digits is 248832, while the sum is 50.

The square root of 18699818 is about 4324.3286184100. The cubic root of 18699818 is about 265.4274246205.

The spelling of 18699818 in words is "eighteen million, six hundred ninety-nine thousand, eight hundred eighteen".