199642044 has 96 divisors (see below), whose sum is σ = 569067520. Its totient is φ = 53203392.

The previous prime is 199642039. The next prime is 199642049. The reversal of 199642044 is 440246991.

It is an interprime number because it is at equal distance from previous prime (199642039) and next prime (199642049).

It is a junction number, because it is equal to n+sod(n) for n = 199641993 and 199642011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199642049) by changing a digit.

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, 105999 + ... + 107865.

Almost surely, 2^199642044 is an apocalyptic number.

199642044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199642044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284533760).

199642044 is an abundant number, since it is smaller than the sum of its proper divisors (369425476).

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

199642044 is a wasteful number, since it uses less digits than its factorization.

199642044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967 (or 1965 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 199642044 is about 14129.4743001996. The cubic root of 199642044 is about 584.4544493921.

The spelling of 199642044 in words is "one hundred ninety-nine million, six hundred forty-two thousand, forty-four".