18103272 has 64 divisors (see below), whose sum is σ = 50457600. Its totient is φ = 5365440.

The previous prime is 18103271. The next prime is 18103273. The reversal of 18103272 is 27230181.

It is an interprime number because it is at equal distance from previous prime (18103271) and next prime (18103273).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 (18103271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11679 + ... + 13137.

It is an arithmetic number, because the mean of its divisors is an integer number (788400).

Almost surely, 2^18103272 is an apocalyptic number.

18103272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18103272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25228800).

18103272 is an abundant number, since it is smaller than the sum of its proper divisors (32354328).

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

18103272 is a wasteful number, since it uses less digits than its factorization.

18103272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526 (or 1522 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 18103272 is about 4254.7940020640. The cubic root of 18103272 is about 262.5743861750.

The spelling of 18103272 in words is "eighteen million, one hundred three thousand, two hundred seventy-two".