199915845 has 8 divisors (see below), whose sum is σ = 319865376. Its totient is φ = 106621776.

The previous prime is 199915843. The next prime is 199915861. The reversal of 199915845 is 548519991.

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

It is not a de Polignac number, because 199915845 - 2¹ = 199915843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199915843) 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, 6663847 + ... + 6663876.

It is an arithmetic number, because the mean of its divisors is an integer number (39983172).

Almost surely, 2^199915845 is an apocalyptic number.

199915845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199915845 is a deficient number, since it is larger than the sum of its proper divisors (119949531).

199915845 is a wasteful number, since it uses less digits than its factorization.

199915845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13327731.

The product of its digits is 583200, while the sum is 51.

The square root of 199915845 is about 14139.1599821206. The cubic root of 199915845 is about 584.7215125645.

The spelling of 199915845 in words is "one hundred ninety-nine million, nine hundred fifteen thousand, eight hundred forty-five".