199439744 has 128 divisors (see below), whose sum is σ = 478094400. Its totient is φ = 81100800.

The previous prime is 199439711. The next prime is 199439749. The reversal of 199439744 is 447934991.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×199439744² = 79552422973571072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 199439692 and 199439701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199439749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2240852 + ... + 2240940.

Almost surely, 2^199439744 is an apocalyptic number.

199439744 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 199439744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239047200).

199439744 is an abundant number, since it is smaller than the sum of its proper divisors (278654656).

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

199439744 is an equidigital number, since it uses as much as digits as its factorization.

199439744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 200 counting only the distinct ones).

The product of its digits is 979776, while the sum is 50.

The square root of 199439744 is about 14122.3136914601. The cubic root of 199439744 is about 584.2569707922.

The spelling of 199439744 in words is "one hundred ninety-nine million, four hundred thirty-nine thousand, seven hundred forty-four".