18259272 has 24 divisors (see below), whose sum is σ = 49452390. Its totient is φ = 6086400.

The previous prime is 18259243. The next prime is 18259273. The reversal of 18259272 is 27295281.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 60516 = 4266^2 + 246^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18259273) 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 in 5 ways as a sum of consecutive naturals, for example, 126729 + ... + 126872.

Almost surely, 2^18259272 is an apocalyptic number.

18259272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18259272 is an abundant number, since it is smaller than the sum of its proper divisors (31193118).

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

18259272 is a wasteful number, since it uses less digits than its factorization.

18259272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253613 (or 253606 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 18259272 is about 4273.0869403746. The cubic root of 18259272 is about 263.3264510655.

The spelling of 18259272 in words is "eighteen million, two hundred fifty-nine thousand, two hundred seventy-two".