18345472 has 20 divisors (see below), whose sum is σ = 36656136. Its totient is φ = 9172480.

The previous prime is 18345461. The next prime is 18345479. The reversal of 18345472 is 27454381.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18345479) by changing a digit.

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, 17404 + ... + 18427.

Almost surely, 2^18345472 is an apocalyptic number.

It is an amenable number.

18345472 is a deficient number, since it is larger than the sum of its proper divisors (18310664).

18345472 is an frugal number, since it uses more digits than its factorization.

18345472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35849 (or 35833 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 18345472 is about 4283.1614492102. The cubic root of 18345472 is about 263.7401790253.

The spelling of 18345472 in words is "eighteen million, three hundred forty-five thousand, four hundred seventy-two".