868381809 has 8 divisors (see below), whose sum is σ = 1158209472. Its totient is φ = 578737680.

The previous prime is 868381799. The next prime is 868381819. The reversal of 868381809 is 908183868.

It is a happy number.

868381809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (868381799) and next prime (868381819).

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

It is a de Polignac number, because none of the positive numbers 2^k-868381809 is a prime.

It is a super-2 number, since 2×868381809² = 1508173932404224962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (868381819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34434 + ... + 54059.

It is an arithmetic number, because the mean of its divisors is an integer number (144776184).

Almost surely, 2^868381809 is an apocalyptic number.

It is an amenable number.

868381809 is a deficient number, since it is larger than the sum of its proper divisors (289827663).

868381809 is a wasteful number, since it uses less digits than its factorization.

868381809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91767.

The product of its (nonzero) digits is 663552, while the sum is 51.

The square root of 868381809 is about 29468.3187338538. The cubic root of 868381809 is about 954.0480299206.

The spelling of 868381809 in words is "eight hundred sixty-eight million, three hundred eighty-one thousand, eight hundred nine".