18031248 has 50 divisors (see below), whose sum is σ = 52191414. Its totient is φ = 6009984.

The previous prime is 18031217. The next prime is 18031249. The reversal of 18031248 is 84213081.

It can be written as a sum of positive squares in only one way, i.e., 16257024 + 1774224 = 4032^2 + 1332^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18031249) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5661 + ... + 8252.

Almost surely, 2^18031248 is an apocalyptic number.

18031248 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18031248 is an abundant number, since it is smaller than the sum of its proper divisors (34160166).

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

18031248 is a wasteful number, since it uses less digits than its factorization.

18031248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13933 (or 13918 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18031248 is about 4246.3217023678. The cubic root of 18031248 is about 262.2257053172.

The spelling of 18031248 in words is "eighteen million, thirty-one thousand, two hundred forty-eight".