868859869 has 4 divisors (see below), whose sum is σ = 869063644. Its totient is φ = 868656096.

The previous prime is 868859861. The next prime is 868859879. The reversal of 868859869 is 968958868.

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 794676100 + 74183769 = 28190^2 + 8613^2 .

It is a cyclic number.

It is not a de Polignac number, because 868859869 - 2³ = 868859861 is a prime.

It is a super-2 number, since 2×868859869² = 1509834943917394322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868859861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95352 + ... + 104065.

It is an arithmetic number, because the mean of its divisors is an integer number (217265911).

Almost surely, 2^868859869 is an apocalyptic number.

It is an amenable number.

868859869 is a deficient number, since it is larger than the sum of its proper divisors (203775).

868859869 is a wasteful number, since it uses less digits than its factorization.

868859869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203774.

The product of its digits is 59719680, while the sum is 67.

The square root of 868859869 is about 29476.4290408455. The cubic root of 868859869 is about 954.2230714082.

The spelling of 868859869 in words is "eight hundred sixty-eight million, eight hundred fifty-nine thousand, eight hundred sixty-nine".