199409865 has 8 divisors (see below), whose sum is σ = 319055808. Its totient is φ = 106351920.

The previous prime is 199409863. The next prime is 199409867. The reversal of 199409865 is 568904991.

It is an interprime number because it is at equal distance from previous prime (199409863) and next prime (199409867).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199409865 - 2¹ = 199409863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199409863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6646981 + ... + 6647010.

It is an arithmetic number, because the mean of its divisors is an integer number (39881976).

Almost surely, 2^199409865 is an apocalyptic number.

199409865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199409865 is a deficient number, since it is larger than the sum of its proper divisors (119645943).

199409865 is a wasteful number, since it uses less digits than its factorization.

199409865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13293999.

The product of its (nonzero) digits is 699840, while the sum is 51.

The square root of 199409865 is about 14121.2557869334. The cubic root of 199409865 is about 584.2277925794.

The spelling of 199409865 in words is "one hundred ninety-nine million, four hundred nine thousand, eight hundred sixty-five".