18893985 has 32 divisors (see below), whose sum is σ = 33758208. Its totient is φ = 8944320.

The previous prime is 18893981. The next prime is 18894019. The reversal of 18893985 is 58939881.

It is not a de Polignac number, because 18893985 - 2² = 18893981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18893981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5764 + ... + 8426.

It is an arithmetic number, because the mean of its divisors is an integer number (1054944).

Almost surely, 2^18893985 is an apocalyptic number.

18893985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18893985 is a deficient number, since it is larger than the sum of its proper divisors (14864223).

18893985 is a wasteful number, since it uses less digits than its factorization.

18893985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725.

The product of its digits is 622080, while the sum is 51.

The square root of 18893985 is about 4346.7211780835. The cubic root of 18893985 is about 266.3429396273.

The spelling of 18893985 in words is "eighteen million, eight hundred ninety-three thousand, nine hundred eighty-five".