199437942 has 64 divisors (see below), whose sum is σ = 453869568. Its totient is φ = 57876000.

The previous prime is 199437929. The next prime is 199437983. The reversal of 199437942 is 249734991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 199437891 and 199437900.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218467 + ... + 219377.

It is an arithmetic number, because the mean of its divisors is an integer number (7091712).

Almost surely, 2^199437942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199437942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226934784).

199437942 is an abundant number, since it is smaller than the sum of its proper divisors (254431626).

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

199437942 is a wasteful number, since it uses less digits than its factorization.

199437942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065.

The product of its digits is 489888, while the sum is 48.

The square root of 199437942 is about 14122.2498915718. The cubic root of 199437942 is about 584.2552111392.

The spelling of 199437942 in words is "one hundred ninety-nine million, four hundred thirty-seven thousand, nine hundred forty-two".