199901944 has 16 divisors (see below), whose sum is σ = 408890520. Its totient is φ = 90864480.

The previous prime is 199901917. The next prime is 199901953. The reversal of 199901944 is 449109991.

It is a junction number, because it is equal to n+sod(n) for n = 199901894 and 199901903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135719 + ... + 1135894.

Almost surely, 2^199901944 is an apocalyptic number.

It is an amenable number.

199901944 is an abundant number, since it is smaller than the sum of its proper divisors (208988576).

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

199901944 is a wasteful number, since it uses less digits than its factorization.

199901944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271630 (or 2271626 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 199901944 is about 14138.6683955739. The cubic root of 199901944 is about 584.7079595248.

The spelling of 199901944 in words is "one hundred ninety-nine million, nine hundred one thousand, nine hundred forty-four".