199994687 has 8 divisors (see below), whose sum is σ = 201962112. Its totient is φ = 198034200.

The previous prime is 199994633. The next prime is 199994689. The reversal of 199994687 is 786499991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199994687 - 2⁶ = 199994623 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 (199994689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70262 + ... + 73052.

It is an arithmetic number, because the mean of its divisors is an integer number (25245264).

Almost surely, 2^199994687 is an apocalyptic number.

199994687 is a deficient number, since it is larger than the sum of its proper divisors (1967425).

199994687 is a wasteful number, since it uses less digits than its factorization.

199994687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3469.

The product of its digits is 8817984, while the sum is 62.

The square root of 199994687 is about 14141.9477795670. The cubic root of 199994687 is about 584.7983691613.

The spelling of 199994687 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, six hundred eighty-seven".