18403272 has 48 divisors (see below), whose sum is σ = 50101740. Its totient is φ = 6102528.

The previous prime is 18403249. The next prime is 18403277. The reversal of 18403272 is 27230481.

It can be written as a sum of positive squares in 2 ways, for example, as 17089956 + 1313316 = 4134^2 + 1146^2 .

It is not an unprimeable number, because it can be changed into a prime (18403277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16228 + ... + 17324.

Almost surely, 2^18403272 is an apocalyptic number.

18403272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18403272 is an abundant number, since it is smaller than the sum of its proper divisors (31698468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18403272 is a wasteful number, since it uses less digits than its factorization.

18403272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342 (or 1335 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18403272 is about 4289.9034954180. The cubic root of 18403272 is about 264.0168721999.

The spelling of 18403272 in words is "eighteen million, four hundred three thousand, two hundred seventy-two".