18730985 has 24 divisors (see below), whose sum is σ = 28163016. Its totient is φ = 11854080.

The previous prime is 18730981. The next prime is 18731021. The reversal of 18730985 is 58903781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1731856 + 16999129 = 1316^2 + 4123^2 .

It is not a de Polignac number, because 18730985 - 2² = 18730981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18730981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 245 + ... + 6125.

It is an arithmetic number, because the mean of its divisors is an integer number (1173459).

Almost surely, 2^18730985 is an apocalyptic number.

It is an amenable number.

18730985 is a deficient number, since it is larger than the sum of its proper divisors (9432031).

18730985 is a wasteful number, since it uses less digits than its factorization.

18730985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5913 (or 5906 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 18730985 is about 4327.9307988922. The cubic root of 18730985 is about 265.5748054635.

The spelling of 18730985 in words is "eighteen million, seven hundred thirty thousand, nine hundred eighty-five".