19894287 has 16 divisors (see below), whose sum is σ = 31633920. Its totient is φ = 10873632.

The previous prime is 19894283. The next prime is 19894289. The reversal of 19894287 is 78249891.

It is not a de Polignac number, because 19894287 - 2² = 19894283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19894283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20112 + ... + 21077.

It is an arithmetic number, because the mean of its divisors is an integer number (1977120).

Almost surely, 2^19894287 is an apocalyptic number.

19894287 is a deficient number, since it is larger than the sum of its proper divisors (11739633).

19894287 is a wasteful number, since it uses less digits than its factorization.

19894287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41222.

The product of its digits is 290304, while the sum is 48.

The square root of 19894287 is about 4460.3012230117. The cubic root of 19894287 is about 270.9626678421.

The spelling of 19894287 in words is "nineteen million, eight hundred ninety-four thousand, two hundred eighty-seven".