18245985 has 32 divisors (see below), whose sum is σ = 31186560. Its totient is φ = 9082368.

The previous prime is 18245957. The next prime is 18245987. The reversal of 18245985 is 58954281.

It is a happy number.

It is not a de Polignac number, because 18245985 - 2¹⁷ = 18114913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18245987) 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 31 ways as a sum of consecutive naturals, for example, 20367 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (974580).

Almost surely, 2^18245985 is an apocalyptic number.

18245985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18245985 is a deficient number, since it is larger than the sum of its proper divisors (12940575).

18245985 is a wasteful number, since it uses less digits than its factorization.

18245985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977.

The product of its digits is 115200, while the sum is 42.

The square root of 18245985 is about 4271.5319266043. The cubic root of 18245985 is about 263.2625626553.

The spelling of 18245985 in words is "eighteen million, two hundred forty-five thousand, nine hundred eighty-five".