18939268 has 6 divisors (see below), whose sum is σ = 33143726. Its totient is φ = 9469632.

The previous prime is 18939259. The next prime is 18939287. The reversal of 18939268 is 86293981.

It can be written as a sum of positive squares in only one way, i.e., 17040384 + 1898884 = 4128^2 + 1378^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2367405 + ... + 2367412.

Almost surely, 2^18939268 is an apocalyptic number.

It is an amenable number.

18939268 is a deficient number, since it is larger than the sum of its proper divisors (14204458).

18939268 is a wasteful number, since it uses less digits than its factorization.

18939268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734821 (or 4734819 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 18939268 is about 4351.9269295336. The cubic root of 18939268 is about 266.5555502335. Note that the first 5 decimals are identical.

The spelling of 18939268 in words is "eighteen million, nine hundred thirty-nine thousand, two hundred sixty-eight".