18897785 has 8 divisors (see below), whose sum is σ = 22700736. Its totient is φ = 15102640.

The previous prime is 18897779. The next prime is 18897797. The reversal of 18897785 is 58779881.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-18897785 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8012 + ... + 10098.

It is an arithmetic number, because the mean of its divisors is an integer number (2837592).

Almost surely, 2^18897785 is an apocalyptic number.

It is an amenable number.

18897785 is a deficient number, since it is larger than the sum of its proper divisors (3802951).

18897785 is a wasteful number, since it uses less digits than its factorization.

18897785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903.

The product of its digits is 1128960, while the sum is 53.

The square root of 18897785 is about 4347.1582671902. The cubic root of 18897785 is about 266.3607942572.

The spelling of 18897785 in words is "eighteen million, eight hundred ninety-seven thousand, seven hundred eighty-five".