18249280 has 56 divisors (see below), whose sum is σ = 49670208. Its totient is φ = 6256128.

The previous prime is 18249277. The next prime is 18249299. The reversal of 18249280 is 8294281.

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1834 + ... + 6313.

It is an arithmetic number, because the mean of its divisors is an integer number (886968).

Almost surely, 2^18249280 is an apocalyptic number.

18249280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18249280 is an abundant number, since it is smaller than the sum of its proper divisors (31420928).

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

18249280 is an equidigital number, since it uses as much as digits as its factorization.

18249280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8171 (or 8161 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18249280 is about 4271.9176022016. The cubic root of 18249280 is about 263.2784090261.

The spelling of 18249280 in words is "eighteen million, two hundred forty-nine thousand, two hundred eighty".