18172280 has 32 divisors (see below), whose sum is σ = 46729440. Its totient is φ = 6230400.

The previous prime is 18172261. The next prime is 18172283. The reversal of 18172280 is 8227181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18172283) 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 7 ways as a sum of consecutive naturals, for example, 32171 + ... + 32730.

It is an arithmetic number, because the mean of its divisors is an integer number (1460295).

Almost surely, 2^18172280 is an apocalyptic number.

18172280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18172280 is an abundant number, since it is smaller than the sum of its proper divisors (28557160).

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

18172280 is a wasteful number, since it uses less digits than its factorization.

18172280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64919 (or 64915 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 18172280 is about 4262.8957294309. The cubic root of 18172280 is about 262.9075995722.

The spelling of 18172280 in words is "eighteen million, one hundred seventy-two thousand, two hundred eighty".