199843959 has 64 divisors (see below), whose sum is σ = 338688000. Its totient is φ = 102187008.

The previous prime is 199843951. The next prime is 199843981. The reversal of 199843959 is 959348991.

It is not a de Polignac number, because 199843959 - 2³ = 199843951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199843899 and 199843908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199843951) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1004142 + ... + 1004340.

It is an arithmetic number, because the mean of its divisors is an integer number (5292000).

Almost surely, 2^199843959 is an apocalyptic number.

199843959 is a deficient number, since it is larger than the sum of its proper divisors (138844041).

199843959 is a wasteful number, since it uses less digits than its factorization.

199843959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352.

The product of its digits is 3149280, while the sum is 57.

The square root of 199843959 is about 14136.6176647740. The cubic root of 199843959 is about 584.6514191880.

The spelling of 199843959 in words is "one hundred ninety-nine million, eight hundred forty-three thousand, nine hundred fifty-nine".