19894147 has 12 divisors (see below), whose sum is σ = 24923136. Its totient is φ = 15739920.

The previous prime is 19894139. The next prime is 19894177. The reversal of 19894147 is 74149891.

It is not a de Polignac number, because 19894147 - 2³ = 19894139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19894177) 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, 14979 + ... + 16252.

It is an arithmetic number, because the mean of its divisors is an integer number (2076928).

Almost surely, 2^19894147 is an apocalyptic number.

19894147 is a deficient number, since it is larger than the sum of its proper divisors (5028989).

19894147 is a wasteful number, since it uses less digits than its factorization.

19894147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31258 (or 31251 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 19894147 is about 4460.2855289768. The cubic root of 19894147 is about 270.9620322348.

The spelling of 19894147 in words is "nineteen million, eight hundred ninety-four thousand, one hundred forty-seven".