18973268 has 6 divisors (see below), whose sum is σ = 33203226. Its totient is φ = 9486632.

The previous prime is 18973249. The next prime is 18973291. The reversal of 18973268 is 86237981.

It can be written as a sum of positive squares in only one way, i.e., 17156164 + 1817104 = 4142^2 + 1348^2 .

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, 2371655 + ... + 2371662.

It is an arithmetic number, because the mean of its divisors is an integer number (5533871).

Almost surely, 2^18973268 is an apocalyptic number.

It is an amenable number.

18973268 is a deficient number, since it is larger than the sum of its proper divisors (14229958).

18973268 is a wasteful number, since it uses less digits than its factorization.

18973268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4743321 (or 4743319 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 18973268 is about 4355.8314935268. The cubic root of 18973268 is about 266.7149627803.

The spelling of 18973268 in words is "eighteen million, nine hundred seventy-three thousand, two hundred sixty-eight".