199988407 has 6 divisors (see below), whose sum is σ = 201097568. Its totient is φ = 198881364.

The previous prime is 199988387. The next prime is 199988413. The reversal of 199988407 is 704889991.

It is not a de Polignac number, because 199988407 - 2²³ = 191599799 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 (199988497) 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, 210708 + ... + 211654.

Almost surely, 2^199988407 is an apocalyptic number.

199988407 is a deficient number, since it is larger than the sum of its proper divisors (1109161).

199988407 is an frugal number, since it uses more digits than its factorization.

199988407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117 (or 1170 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 199988407 is about 14141.7257433455. The cubic root of 199988407 is about 584.7922480450.

The spelling of 199988407 in words is "one hundred ninety-nine million, nine hundred eighty-eight thousand, four hundred seven".