199999840 has 24 divisors (see below), whose sum is σ = 472500000. Its totient is φ = 79999872.

The previous prime is 199999831. The next prime is 199999841. The reversal of 199999840 is 48999991.

199999840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624840 + ... + 625159.

It is an arithmetic number, because the mean of its divisors is an integer number (19687500).

Almost surely, 2^199999840 is an apocalyptic number.

199999840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199999840 is an abundant number, since it is smaller than the sum of its proper divisors (272500160).

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

199999840 is a wasteful number, since it uses less digits than its factorization.

199999840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250014 (or 1250006 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 58.

The square root of 199999840 is about 14142.1299668756. The cubic root of 199999840 is about 584.8033916949.

The spelling of 199999840 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred forty".