18668738 has 8 divisors (see below), whose sum is σ = 30548880. Its totient is φ = 8485780.

The previous prime is 18668701. The next prime is 18668753. The reversal of 18668738 is 83786681.

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

It is a junction number, because it is equal to n+sod(n) for n = 18668692 and 18668701.

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, 424268 + ... + 424311.

It is an arithmetic number, because the mean of its divisors is an integer number (3818610).

Almost surely, 2^18668738 is an apocalyptic number.

18668738 is a deficient number, since it is larger than the sum of its proper divisors (11880142).

18668738 is a wasteful number, since it uses less digits than its factorization.

18668738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848592.

The product of its digits is 387072, while the sum is 47.

The square root of 18668738 is about 4320.7335025433. The cubic root of 18668738 is about 265.2802920133.

The spelling of 18668738 in words is "eighteen million, six hundred sixty-eight thousand, seven hundred thirty-eight".