199941997 has 8 divisors (see below), whose sum is σ = 210893760. Its totient is φ = 189033120.

The previous prime is 199941991. The next prime is 199942009. The reversal of 199941997 is 799149991.

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 199941997 - 2²³ = 191553389 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 (199941991) 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, 904 + ... + 20017.

It is an arithmetic number, because the mean of its divisors is an integer number (26361720).

Almost surely, 2^199941997 is an apocalyptic number.

It is an amenable number.

199941997 is a deficient number, since it is larger than the sum of its proper divisors (10951763).

199941997 is a wasteful number, since it uses less digits than its factorization.

199941997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21443.

The product of its digits is 1653372, while the sum is 58.

The square root of 199941997 is about 14140.0847592933. The cubic root of 199941997 is about 584.7470082428.

The spelling of 199941997 in words is "one hundred ninety-nine million, nine hundred forty-one thousand, nine hundred ninety-seven".