868442309 has 8 divisors (see below), whose sum is σ = 995699328. Its totient is φ = 741983760.

The previous prime is 868442287. The next prime is 868442317. The reversal of 868442309 is 903244868.

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

It is not a de Polignac number, because 868442309 - 2²⁸ = 600006853 is a prime.

It is a super-2 number, since 2×868442309² = 1508384088122502962, 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 868442309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868442609) 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, 197282 + ... + 201635.

It is an arithmetic number, because the mean of its divisors is an integer number (124462416).

Almost surely, 2^868442309 is an apocalyptic number.

It is an amenable number.

868442309 is a deficient number, since it is larger than the sum of its proper divisors (127257019).

868442309 is a wasteful number, since it uses less digits than its factorization.

868442309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399235.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 868442309 is about 29469.3452421325. The cubic root of 868442309 is about 954.0701855227.

The spelling of 868442309 in words is "eight hundred sixty-eight million, four hundred forty-two thousand, three hundred nine".