18668426 has 32 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 7750656.

The previous prime is 18668423. The next prime is 18668437. The reversal of 18668426 is 62486681.

It is not an unprimeable number, because it can be changed into a prime (18668423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80006 + ... + 80238.

It is an arithmetic number, because the mean of its divisors is an integer number (1031940).

Almost surely, 2^18668426 is an apocalyptic number.

18668426 is a deficient number, since it is larger than the sum of its proper divisors (14353654).

18668426 is a wasteful number, since it uses less digits than its factorization.

18668426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398.

The product of its digits is 110592, while the sum is 41.

The square root of 18668426 is about 4320.6973974117. The cubic root of 18668426 is about 265.2788141789.

The spelling of 18668426 in words is "eighteen million, six hundred sixty-eight thousand, four hundred twenty-six".