199976999 has 4 divisors (see below), whose sum is σ = 200273064. Its totient is φ = 199680936.

The previous prime is 199976983. The next prime is 199977017. The reversal of 199976999 is 999679991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199976999 - 2⁴ = 199976983 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 (199976929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147017 + ... + 148370.

It is an arithmetic number, because the mean of its divisors is an integer number (50068266).

Almost surely, 2^199976999 is an apocalyptic number.

199976999 is a deficient number, since it is larger than the sum of its proper divisors (296065).

199976999 is an equidigital number, since it uses as much as digits as its factorization.

199976999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296064.

The product of its digits is 22320522, while the sum is 68.

The square root of 199976999 is about 14141.3223921952. The cubic root of 199976999 is about 584.7811283391.

The spelling of 199976999 in words is "one hundred ninety-nine million, nine hundred seventy-six thousand, nine hundred ninety-nine".