199785705 has 32 divisors (see below), whose sum is σ = 381210624. Its totient is φ = 87358656.

The previous prime is 199785689. The next prime is 199785713. The reversal of 199785705 is 507587991.

It is not a de Polignac number, because 199785705 - 2⁴ = 199785689 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38949 + ... + 43778.

It is an arithmetic number, because the mean of its divisors is an integer number (11912832).

Almost surely, 2^199785705 is an apocalyptic number.

199785705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199785705 is a deficient number, since it is larger than the sum of its proper divisors (181424919).

199785705 is a wasteful number, since it uses less digits than its factorization.

199785705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82765.

The product of its (nonzero) digits is 793800, while the sum is 51.

The square root of 199785705 is about 14134.5571207590. The cubic root of 199785705 is about 584.5946055390.

The spelling of 199785705 in words is "one hundred ninety-nine million, seven hundred eighty-five thousand, seven hundred five".