199640281 has 8 divisors (see below), whose sum is σ = 201243744. Its totient is φ = 198041760.

The previous prime is 199640249. The next prime is 199640291. The reversal of 199640281 is 182046991.

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

It is a cyclic number.

It is not a de Polignac number, because 199640281 - 2⁵ = 199640249 is a prime.

It is a super-2 number, since 2×199640281² = 79712483595517922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199640291) 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, 134061 + ... + 135541.

It is an arithmetic number, because the mean of its divisors is an integer number (25155468).

Almost surely, 2^199640281 is an apocalyptic number.

It is an amenable number.

199640281 is a deficient number, since it is larger than the sum of its proper divisors (1603463).

199640281 is a wasteful number, since it uses less digits than its factorization.

199640281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 199640281 is about 14129.4119127443. The cubic root of 199640281 is about 584.4527289859.

The spelling of 199640281 in words is "one hundred ninety-nine million, six hundred forty thousand, two hundred eighty-one".