199826865 has 32 divisors (see below), whose sum is σ = 405999360. Its totient is φ = 91348992.

The previous prime is 199826863. The next prime is 199826903. The reversal of 199826865 is 568628991.

It is a happy number.

It is not a de Polignac number, because 199826865 - 2¹ = 199826863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199826863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104784 + ... + 106673.

It is an arithmetic number, because the mean of its divisors is an integer number (12687480).

Almost surely, 2^199826865 is an apocalyptic number.

199826865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199826865 is an abundant number, since it is smaller than the sum of its proper divisors (206172495).

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

199826865 is a wasteful number, since it uses less digits than its factorization.

199826865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211478 (or 211472 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 199826865 is about 14136.0130517767. The cubic root of 199826865 is about 584.6347489879.

The spelling of 199826865 in words is "one hundred ninety-nine million, eight hundred twenty-six thousand, eight hundred sixty-five".