18289748 has 6 divisors (see below), whose sum is σ = 32007066. Its totient is φ = 9144872.

The previous prime is 18289709. The next prime is 18289751. The reversal of 18289748 is 84798281.

It can be written as a sum of positive squares in only one way, i.e., 15460624 + 2829124 = 3932^2 + 1682^2 .

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, 2286215 + ... + 2286222.

It is an arithmetic number, because the mean of its divisors is an integer number (5334511).

Almost surely, 2^18289748 is an apocalyptic number.

It is an amenable number.

18289748 is a deficient number, since it is larger than the sum of its proper divisors (13717318).

18289748 is a wasteful number, since it uses less digits than its factorization.

18289748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572441 (or 4572439 counting only the distinct ones).

The product of its digits is 258048, while the sum is 47.

The square root of 18289748 is about 4276.6514938676. The cubic root of 18289748 is about 263.4728730444.

The spelling of 18289748 in words is "eighteen million, two hundred eighty-nine thousand, seven hundred forty-eight".