18896985 has 12 divisors (see below), whose sum is σ = 32754852. Its totient is φ = 10078368.

The previous prime is 18896959. The next prime is 18896989. The reversal of 18896985 is 58969881.

It can be written as a sum of positive squares in 2 ways, for example, as 6702921 + 12194064 = 2589^2 + 3492^2 .

It is not a de Polignac number, because 18896985 - 2⁶ = 18896921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18896989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209922 + ... + 210011.

It is an arithmetic number, because the mean of its divisors is an integer number (2729571).

Almost surely, 2^18896985 is an apocalyptic number.

18896985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18896985 is a deficient number, since it is larger than the sum of its proper divisors (13857867).

18896985 is a wasteful number, since it uses less digits than its factorization.

18896985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419944 (or 419941 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 18896985 is about 4347.0662520831. The cubic root of 18896985 is about 266.3570355867.

It can be divided in two parts, 18896 and 985, that added together give a square (19881 = 141²).

The spelling of 18896985 in words is "eighteen million, eight hundred ninety-six thousand, nine hundred eighty-five".