199787045 has 12 divisors (see below), whose sum is σ = 241194060. Its totient is φ = 158868864.

The previous prime is 199787041. The next prime is 199787069. The reversal of 199787045 is 540787991.

It can be written as a sum of positive squares in 2 ways, for example, as 66569281 + 133217764 = 8159^2 + 11542^2 .

It is not a de Polignac number, because 199787045 - 2² = 199787041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199786984 and 199787002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199787041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197501 + ... + 198509.

It is an arithmetic number, because the mean of its divisors is an integer number (20099505).

Almost surely, 2^199787045 is an apocalyptic number.

It is an amenable number.

199787045 is a deficient number, since it is larger than the sum of its proper divisors (41407015).

199787045 is an equidigital number, since it uses as much as digits as its factorization.

199787045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 199787045 is about 14134.6045222355. The cubic root of 199787045 is about 584.5959125311.

The spelling of 199787045 in words is "one hundred ninety-nine million, seven hundred eighty-seven thousand, forty-five".