199997045 has 8 divisors (see below), whose sum is σ = 241829280. Its totient is φ = 158775760.

The previous prime is 199997041. The next prime is 199997053. The reversal of 199997045 is 540799991.

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

It is not a de Polignac number, because 199997045 - 2² = 199997041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199997041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152015 + ... + 153324.

It is an arithmetic number, because the mean of its divisors is an integer number (30228660).

Almost surely, 2^199997045 is an apocalyptic number.

It is an amenable number.

199997045 is a deficient number, since it is larger than the sum of its proper divisors (41832235).

199997045 is a wasteful number, since it uses less digits than its factorization.

199997045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305475.

The product of its (nonzero) digits is 918540, while the sum is 53.

The square root of 199997045 is about 14142.0311483181. The cubic root of 199997045 is about 584.8006674709.

The spelling of 199997045 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, forty-five".