18912285 has 60 divisors (see below), whose sum is σ = 39478428. Its totient is φ = 8636544.

The previous prime is 18912269. The next prime is 18912287. The reversal of 18912285 is 58221981.

It can be written as a sum of positive squares in 2 ways, for example, as 7338681 + 11573604 = 2709^2 + 3402^2 .

It is not a de Polignac number, because 18912285 - 2⁴ = 18912269 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18912287) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 19369 + ... + 20321.

Almost surely, 2^18912285 is an apocalyptic number.

18912285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18912285 is an abundant number, since it is smaller than the sum of its proper divisors (20566143).

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

18912285 is an equidigital number, since it uses as much as digits as its factorization.

18912285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984 (or 968 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 18912285 is about 4348.8257035664. The cubic root of 18912285 is about 266.4289017828.

The spelling of 18912285 in words is "eighteen million, nine hundred twelve thousand, two hundred eighty-five".