199993645 has 16 divisors (see below), whose sum is σ = 250221312. Its totient is φ = 153316800.

The previous prime is 199993643. The next prime is 199993663. The reversal of 199993645 is 546399991.

It is not a de Polignac number, because 199993645 - 2¹ = 199993643 is a prime.

It is a super-3 number, since 3×199993645³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199993643) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2620 + ... + 20170.

It is an arithmetic number, because the mean of its divisors is an integer number (15638832).

Almost surely, 2^199993645 is an apocalyptic number.

It is an amenable number.

199993645 is a deficient number, since it is larger than the sum of its proper divisors (50227667).

199993645 is a wasteful number, since it uses less digits than its factorization.

199993645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17652.

The product of its digits is 2361960, while the sum is 55.

The square root of 199993645 is about 14141.9109387664. The cubic root of 199993645 is about 584.7973535327.

The spelling of 199993645 in words is "one hundred ninety-nine million, nine hundred ninety-three thousand, six hundred forty-five".