199870 has 32 divisors (see below), whose sum is σ = 414720. Its totient is φ = 68640.

The previous prime is 199853. The next prime is 199873. The reversal of 199870 is 78991.

199870 = 16² + 17² + ... + 84².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2491 + ... + 2569.

It is an arithmetic number, because the mean of its divisors is an integer number (12960).

2¹⁹⁹⁸⁷⁰ is an apocalyptic number.

199870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199870 is an abundant number, since it is smaller than the sum of its proper divisors (214850).

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

199870 is a wasteful number, since it uses less digits than its factorization.

199870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 199870 is about 447.0682274553. The cubic root of 199870 is about 58.4676812744.

It can be divided in two parts, 19 and 9870, that added together give a palindrome (9889).

The spelling of 199870 in words is "one hundred ninety-nine thousand, eight hundred seventy".