19893717 has 6 divisors (see below), whose sum is σ = 28735382. Its totient is φ = 13262472.

The previous prime is 19893697. The next prime is 19893719. The reversal of 19893717 is 71739891.

It can be written as a sum of positive squares in only one way, i.e., 18740241 + 1153476 = 4329^2 + 1074^2 .

It is not a de Polignac number, because 19893717 - 2²⁴ = 3116501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19893719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1105198 + ... + 1105215.

Almost surely, 2^19893717 is an apocalyptic number.

It is an amenable number.

19893717 is a deficient number, since it is larger than the sum of its proper divisors (8841665).

19893717 is a wasteful number, since it uses less digits than its factorization.

19893717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210419 (or 2210416 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 19893717 is about 4460.2373255243. The cubic root of 19893717 is about 270.9600799937.

The spelling of 19893717 in words is "nineteen million, eight hundred ninety-three thousand, seven hundred seventeen".