18007268 has 6 divisors (see below), whose sum is σ = 31512726. Its totient is φ = 9003632.

The previous prime is 18007259. The next prime is 18007273. The reversal of 18007268 is 86270081.

It can be written as a sum of positive squares in only one way, i.e., 17656804 + 350464 = 4202^2 + 592^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2250905 + ... + 2250912.

It is an arithmetic number, because the mean of its divisors is an integer number (5252121).

Almost surely, 2^18007268 is an apocalyptic number.

It is an amenable number.

18007268 is a deficient number, since it is larger than the sum of its proper divisors (13505458).

18007268 is a wasteful number, since it uses less digits than its factorization.

18007268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501821 (or 4501819 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 18007268 is about 4243.4971426879. The cubic root of 18007268 is about 262.1094079123.

The spelling of 18007268 in words is "eighteen million, seven thousand, two hundred sixty-eight".