18693994 has 8 divisors (see below), whose sum is σ = 30590208. Its totient is φ = 8497260.

The previous prime is 18693979. The next prime is 18694031. The reversal of 18693994 is 49939681.

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, 424842 + ... + 424885.

It is an arithmetic number, because the mean of its divisors is an integer number (3823776).

Almost surely, 2^18693994 is an apocalyptic number.

18693994 is a deficient number, since it is larger than the sum of its proper divisors (11896214).

18693994 is a wasteful number, since it uses less digits than its factorization.

18693994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849740.

The product of its digits is 419904, while the sum is 49.

The square root of 18693994 is about 4323.6551666385. The cubic root of 18693994 is about 265.3998662448.

The spelling of 18693994 in words is "eighteen million, six hundred ninety-three thousand, nine hundred ninety-four".