199740977 has 8 divisors (see below), whose sum is σ = 215144160. Its totient is φ = 184826880.

The previous prime is 199740943. The next prime is 199740979. The reversal of 199740977 is 779047991.

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 199740977 - 2²⁰ = 198692401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199740979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121424 + ... + 123057.

It is an arithmetic number, because the mean of its divisors is an integer number (26893020).

Almost surely, 2^199740977 is an apocalyptic number.

It is an amenable number.

199740977 is a deficient number, since it is larger than the sum of its proper divisors (15403183).

199740977 is a wasteful number, since it uses less digits than its factorization.

199740977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244543.

The product of its (nonzero) digits is 1000188, while the sum is 53.

The square root of 199740977 is about 14132.9748107042. The cubic root of 199740977 is about 584.5509759592.

The spelling of 199740977 in words is "one hundred ninety-nine million, seven hundred forty thousand, nine hundred seventy-seven".