199639867 has 12 divisors (see below), whose sum is σ = 232466976. Its totient is φ = 170948400.

The previous prime is 199639861. The next prime is 199639903. The reversal of 199639867 is 768936991.

It is a de Polignac number, because none of the positive numbers 2^k-199639867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199639861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83742 + ... + 86092.

It is an arithmetic number, because the mean of its divisors is an integer number (19372248).

Almost surely, 2^199639867 is an apocalyptic number.

199639867 is a deficient number, since it is larger than the sum of its proper divisors (32827109).

199639867 is a wasteful number, since it uses less digits than its factorization.

199639867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098 (or 4091 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 58.

The square root of 199639867 is about 14129.3972624454. The cubic root of 199639867 is about 584.4523249867.

The spelling of 199639867 in words is "one hundred ninety-nine million, six hundred thirty-nine thousand, eight hundred sixty-seven".