199540 has 24 divisors (see below), whose sum is σ = 457632. Its totient is φ = 72480.

The previous prime is 199523. The next prime is 199559. The reversal of 199540 is 45991.

199540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 199499 and 199508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234 + ... + 673.

It is an arithmetic number, because the mean of its divisors is an integer number (19068).

2¹⁹⁹⁵⁴⁰ is an apocalyptic number.

199540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199540 is an abundant number, since it is smaller than the sum of its proper divisors (258092).

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

199540 is a wasteful number, since it uses less digits than its factorization.

199540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 199540 is about 446.6990038046. The cubic root of 199540 is about 58.4354854082.

It can be divided in two parts, 1995 and 40, that multiplied together give a triangular number (79800 = T₃₉₉).

The spelling of 199540 in words is "one hundred ninety-nine thousand, five hundred forty".