199999780 has 24 divisors (see below), whose sum is σ = 421892352. Its totient is φ = 79639392.

The previous prime is 199999777. The next prime is 199999819. The reversal of 199999780 is 87999991.

199999780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 17962 + ... + 26881.

It is an arithmetic number, because the mean of its divisors is an integer number (17578848).

Almost surely, 2^199999780 is an apocalyptic number.

199999780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199999780 is an abundant number, since it is smaller than the sum of its proper divisors (221892572).

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

199999780 is a wasteful number, since it uses less digits than its factorization.

199999780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45075 (or 45073 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 61.

The square root of 199999780 is about 14142.1278455542. The cubic root of 199999780 is about 584.8033332145.

The spelling of 199999780 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred eighty".