199689840 has 320 divisors, whose sum is σ = 805662720. Its totient is φ = 44513280.

The previous prime is 199689797. The next prime is 199689881. The reversal of 199689840 is 48986991.

199689840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 710500 + ... + 710780.

It is an arithmetic number, because the mean of its divisors is an integer number (2517696).

Almost surely, 2^199689840 is an apocalyptic number.

199689840 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 199689840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402831360).

199689840 is an abundant number, since it is smaller than the sum of its proper divisors (605972880).

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

199689840 is a wasteful number, since it uses less digits than its factorization.

199689840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 199689840 is about 14131.1655570232. The cubic root of 199689840 is about 584.5010867893.

The spelling of 199689840 in words is "one hundred ninety-nine million, six hundred eighty-nine thousand, eight hundred forty".