105867809 has 4 divisors (see below), whose sum is σ = 106280004. Its totient is φ = 105455616.

The previous prime is 105867803. The next prime is 105867851. The reversal of 105867809 is 908768501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50410000 + 55457809 = 7100^2 + 7447^2 .

It is a cyclic number.

It is not a de Polignac number, because 105867809 - 2⁴ = 105867793 is a prime.

It is a super-2 number, since 2×105867809² = 22415985964920962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105867809.

It is not an unprimeable number, because it can be changed into a prime (105867803) 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 3 ways as a sum of consecutive naturals, for example, 205712 + ... + 206225.

It is an arithmetic number, because the mean of its divisors is an integer number (26570001).

Almost surely, 2^105867809 is an apocalyptic number.

It is an amenable number.

105867809 is a deficient number, since it is larger than the sum of its proper divisors (412195).

105867809 is an equidigital number, since it uses as much as digits as its factorization.

105867809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412194.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 105867809 is about 10289.2083757692. The cubic root of 105867809 is about 473.0655345015.

The spelling of 105867809 in words is "one hundred five million, eight hundred sixty-seven thousand, eight hundred nine".