18668726 has 4 divisors (see below), whose sum is σ = 28003092. Its totient is φ = 9334362.

The previous prime is 18668701. The next prime is 18668753. The reversal of 18668726 is 62786681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62786681 = 2897 ⋅21673.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4667180 + ... + 4667183.

It is an arithmetic number, because the mean of its divisors is an integer number (7000773).

Almost surely, 2^18668726 is an apocalyptic number.

18668726 is a deficient number, since it is larger than the sum of its proper divisors (9334366).

18668726 is an equidigital number, since it uses as much as digits as its factorization.

18668726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9334365.

The product of its digits is 193536, while the sum is 44.

The square root of 18668726 is about 4320.7321138900. The cubic root of 18668726 is about 265.2802351738.

The spelling of 18668726 in words is "eighteen million, six hundred sixty-eight thousand, seven hundred twenty-six".