199940520 has 96 divisors (see below), whose sum is σ = 649576800. Its totient is φ = 49211136.

The previous prime is 199940479. The next prime is 199940537. The reversal of 199940520 is 25049991.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15351 + ... + 25209.

It is an arithmetic number, because the mean of its divisors is an integer number (6766425).

Almost surely, 2^199940520 is an apocalyptic number.

199940520 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 199940520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324788400).

199940520 is an abundant number, since it is smaller than the sum of its proper divisors (449636280).

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

199940520 is a wasteful number, since it uses less digits than its factorization.

199940520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9899 (or 9882 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 199940520 is about 14140.0325317872. The cubic root of 199940520 is about 584.7455683695.

The spelling of 199940520 in words is "one hundred ninety-nine million, nine hundred forty thousand, five hundred twenty".