199994645 has 8 divisors (see below), whose sum is σ = 242370360. Its totient is φ = 158411200.

The previous prime is 199994633. The next prime is 199994689. The reversal of 199994645 is 546499991.

It can be written as a sum of positive squares in 4 ways, for example, as 32913169 + 167081476 = 5737^2 + 12926^2 .

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

It is not a de Polignac number, because 199994645 - 2⁴ = 199994629 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 197510 + ... + 198519.

It is an arithmetic number, because the mean of its divisors is an integer number (30296295).

Almost surely, 2^199994645 is an apocalyptic number.

It is an amenable number.

199994645 is a deficient number, since it is larger than the sum of its proper divisors (42375715).

199994645 is a wasteful number, since it uses less digits than its factorization.

199994645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396135.

The product of its digits is 3149280, while the sum is 56.

The square root of 199994645 is about 14141.9462946230. The cubic root of 199994645 is about 584.7983282243.

It can be divided in two parts, 1999946 and 45, that added together give a palindrome (1999991).

The spelling of 199994645 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, six hundred forty-five".