199899420 has 72 divisors (see below), whose sum is σ = 651110544. Its totient is φ = 45690624.

The previous prime is 199899383. The next prime is 199899421. The reversal of 199899420 is 24998991.

It is a happy number.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199899421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31057 + ... + 36936.

It is an arithmetic number, because the mean of its divisors is an integer number (9043202).

Almost surely, 2^199899420 is an apocalyptic number.

199899420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199899420 is an abundant number, since it is smaller than the sum of its proper divisors (451211124).

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

199899420 is a wasteful number, since it uses less digits than its factorization.

199899420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68019 (or 68010 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 51.

The square root of 199899420 is about 14138.5791365328. The cubic root of 199899420 is about 584.7054986364.

The spelling of 199899420 in words is "one hundred ninety-nine million, eight hundred ninety-nine thousand, four hundred twenty".