18280485 has 20 divisors (see below), whose sum is σ = 32770188. Its totient is φ = 9749376.

The previous prime is 18280477. The next prime is 18280487. The reversal of 18280485 is 58408281.

It can be written as a sum of positive squares in 2 ways, for example, as 4397409 + 13883076 = 2097^2 + 3726^2 .

It is not a de Polignac number, because 18280485 - 2³ = 18280477 is a prime.

It is a super-2 number, since 2×18280485² = 668352263670450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18280487) 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 19 ways as a sum of consecutive naturals, for example, 22164 + ... + 22973.

Almost surely, 2^18280485 is an apocalyptic number.

18280485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18280485 is a deficient number, since it is larger than the sum of its proper divisors (14489703).

18280485 is an equidigital number, since it uses as much as digits as its factorization.

18280485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45154 (or 45145 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 18280485 is about 4275.5683832679. The cubic root of 18280485 is about 263.4283861666.

The spelling of 18280485 in words is "eighteen million, two hundred eighty thousand, four hundred eighty-five".