19997199 has 14 divisors (see below), whose sum is σ = 29983176. Its totient is φ = 13330980.

The previous prime is 19997183. The next prime is 19997209. The reversal of 19997199 is 99179991.

It is not a de Polignac number, because 19997199 - 2⁴ = 19997183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19997119) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 12987 + ... + 14444.

Almost surely, 2^19997199 is an apocalyptic number.

19997199 is a deficient number, since it is larger than the sum of its proper divisors (9985977).

19997199 is an frugal number, since it uses more digits than its factorization.

19997199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27449 (or 27434 counting only the distinct ones).

The product of its digits is 413343, while the sum is 54.

The square root of 19997199 is about 4471.8227827140. The cubic root of 19997199 is about 271.4290892616.

The spelling of 19997199 in words is "nineteen million, nine hundred ninety-seven thousand, one hundred ninety-nine".