199870780 has 12 divisors (see below), whose sum is σ = 419728680. Its totient is φ = 79948304.

The previous prime is 199870739. The next prime is 199870789. The reversal of 199870780 is 87078991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199870789) 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, 4996750 + ... + 4996789.

It is an arithmetic number, because the mean of its divisors is an integer number (34977390).

Almost surely, 2^199870780 is an apocalyptic number.

199870780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199870780 is an abundant number, since it is smaller than the sum of its proper divisors (219857900).

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

199870780 is a wasteful number, since it uses less digits than its factorization.

199870780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9993548 (or 9993546 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 199870780 is about 14137.5662686334. The cubic root of 199870780 is about 584.6775733173.

The spelling of 199870780 in words is "one hundred ninety-nine million, eight hundred seventy thousand, seven hundred eighty".