18947312 has 10 divisors (see below), whose sum is σ = 36710448. Its totient is φ = 9473648.

The previous prime is 18947311. The next prime is 18947321. The reversal of 18947312 is 21374981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 592088 + ... + 592119.

Almost surely, 2^18947312 is an apocalyptic number.

It is an amenable number.

18947312 is a deficient number, since it is larger than the sum of its proper divisors (17763136).

18947312 is a wasteful number, since it uses less digits than its factorization.

18947312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184215 (or 1184209 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 18947312 is about 4352.8510197341. The cubic root of 18947312 is about 266.5932825850.

The spelling of 18947312 in words is "eighteen million, nine hundred forty-seven thousand, three hundred twelve".