868642 has 8 divisors (see below), whose sum is σ = 1371600. Its totient is φ = 411444.

The previous prime is 868639. The next prime is 868663. The reversal of 868642 is 246868.

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

It is a junction number, because it is equal to n+sod(n) for n = 868598 and 868607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11392 + ... + 11467.

It is an arithmetic number, because the mean of its divisors is an integer number (171450).

2⁸⁶⁸⁶⁴² is an apocalyptic number.

868642 is a deficient number, since it is larger than the sum of its proper divisors (502958).

868642 is a wasteful number, since it uses less digits than its factorization.

868642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22880.

The product of its digits is 18432, while the sum is 34.

The square root of 868642 is about 932.0096566023. The cubic root of 868642 is about 95.4143306722.

The spelling of 868642 in words is "eight hundred sixty-eight thousand, six hundred forty-two".