199593640 has 16 divisors (see below), whose sum is σ = 449085780. Its totient is φ = 79837440.

The previous prime is 199593619. The next prime is 199593643. The reversal of 199593640 is 46395991.

It can be written as a sum of positive squares in 2 ways, for example, as 190605636 + 8988004 = 13806^2 + 2998^2 .

It is a super-2 number, since 2×199593640² = 79675242256899200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199593643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2494881 + ... + 2494960.

Almost surely, 2^199593640 is an apocalyptic number.

199593640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199593640 is an abundant number, since it is smaller than the sum of its proper divisors (249492140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199593640 is a wasteful number, since it uses less digits than its factorization.

199593640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989852 (or 4989848 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 199593640 is about 14127.7613230122. The cubic root of 199593640 is about 584.4072111464.

The spelling of 199593640 in words is "one hundred ninety-nine million, five hundred ninety-three thousand, six hundred forty".