18741985 has 4 divisors (see below), whose sum is σ = 22490388. Its totient is φ = 14993584.

The previous prime is 18741979. The next prime is 18742021. The reversal of 18741985 is 58914781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2193361 + 16548624 = 1481^2 + 4068^2 .

It is a cyclic number.

It is not a de Polignac number, because 18741985 - 2⁵ = 18741953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874194 + ... + 1874203.

It is an arithmetic number, because the mean of its divisors is an integer number (5622597).

Almost surely, 2^18741985 is an apocalyptic number.

It is an amenable number.

18741985 is a deficient number, since it is larger than the sum of its proper divisors (3748403).

18741985 is an equidigital number, since it uses as much as digits as its factorization.

18741985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748402.

The product of its digits is 80640, while the sum is 43.

The square root of 18741985 is about 4329.2014275152. The cubic root of 18741985 is about 265.6267826409.

The spelling of 18741985 in words is "eighteen million, seven hundred forty-one thousand, nine hundred eighty-five".