199640234 has 32 divisors (see below), whose sum is σ = 326062800. Its totient is φ = 91445760.

The previous prime is 199640227. The next prime is 199640237. The reversal of 199640234 is 432046991.

199640234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 38477209 + 161163025 = 6203^2 + 12695^2 .

It is not an unprimeable number, because it can be changed into a prime (199640237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86852 + ... + 89120.

Almost surely, 2^199640234 is an apocalyptic number.

199640234 is a deficient number, since it is larger than the sum of its proper divisors (126422566).

199640234 is a wasteful number, since it uses less digits than its factorization.

199640234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 199640234 is about 14129.4102495469. The cubic root of 199640234 is about 584.4526831213.

The spelling of 199640234 in words is "one hundred ninety-nine million, six hundred forty thousand, two hundred thirty-four".