18432985 has 8 divisors (see below), whose sum is σ = 22659336. Its totient is φ = 14386560.

The previous prime is 18432979. The next prime is 18432989. The reversal of 18432985 is 58923481.

It can be written as a sum of positive squares in 4 ways, for example, as 994009 + 17438976 = 997^2 + 4176^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18432985 - 2⁷ = 18432857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18432989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44754 + ... + 45163.

It is an arithmetic number, because the mean of its divisors is an integer number (2832417).

Almost surely, 2^18432985 is an apocalyptic number.

It is an amenable number.

18432985 is a deficient number, since it is larger than the sum of its proper divisors (4226351).

18432985 is an equidigital number, since it uses as much as digits as its factorization.

18432985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89963.

The product of its digits is 69120, while the sum is 40.

The square root of 18432985 is about 4293.3652302128. The cubic root of 18432985 is about 264.1588852652.

The spelling of 18432985 in words is "eighteen million, four hundred thirty-two thousand, nine hundred eighty-five".