199736685 has 20 divisors (see below), whose sum is σ = 358047228. Its totient is φ = 106526016.

The previous prime is 199736657. The next prime is 199736731. The reversal of 199736685 is 586637991.

It can be written as a sum of positive squares in 2 ways, for example, as 37785609 + 161951076 = 6147^2 + 12726^2 .

It is not a de Polignac number, because 199736685 - 2²⁵ = 166182253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 246184 + ... + 246993.

Almost surely, 2^199736685 is an apocalyptic number.

199736685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199736685 is a deficient number, since it is larger than the sum of its proper divisors (158310543).

199736685 is an equidigital number, since it uses as much as digits as its factorization.

199736685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493194 (or 493185 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 199736685 is about 14132.8229664140. The cubic root of 199736685 is about 584.5467890187.

The spelling of 199736685 in words is "one hundred ninety-nine million, seven hundred thirty-six thousand, six hundred eighty-five".