19894985 has 8 divisors (see below), whose sum is σ = 26044416. Its totient is φ = 14469040.

The previous prime is 19894969. The next prime is 19895009. The reversal of 19894985 is 58949891.

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

It is not a de Polignac number, because 19894985 - 2⁴ = 19894969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180809 + ... + 180918.

It is an arithmetic number, because the mean of its divisors is an integer number (3255552).

Almost surely, 2^19894985 is an apocalyptic number.

It is an amenable number.

19894985 is a deficient number, since it is larger than the sum of its proper divisors (6149431).

19894985 is a wasteful number, since it uses less digits than its factorization.

19894985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361743.

The product of its digits is 933120, while the sum is 53.

The square root of 19894985 is about 4460.3794681619. The cubic root of 19894985 is about 270.9658367541.

The spelling of 19894985 in words is "nineteen million, eight hundred ninety-four thousand, nine hundred eighty-five".