199944520 has 64 divisors (see below), whose sum is σ = 476202240. Its totient is φ = 75398400.

The previous prime is 199944517. The next prime is 199944557. The reversal of 199944520 is 25449991.

It is a super-2 number, since 2×199944520² = 79955622156060800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63790 + ... + 66850.

It is an arithmetic number, because the mean of its divisors is an integer number (7440660).

Almost surely, 2^199944520 is an apocalyptic number.

199944520 is a gapful number since it is divisible by the number (10) 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 199944520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238101120).

199944520 is an abundant number, since it is smaller than the sum of its proper divisors (276257720).

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

199944520 is a wasteful number, since it uses less digits than its factorization.

199944520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166 (or 3162 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 199944520 is about 14140.1739734701. The cubic root of 199944520 is about 584.7494678070.

The spelling of 199944520 in words is "one hundred ninety-nine million, nine hundred forty-four thousand, five hundred twenty".