868990 has 16 divisors (see below), whose sum is σ = 1588752. Its totient is φ = 342144.

The previous prime is 868957. The next prime is 868993. The reversal of 868990 is 99868.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868993) by changing a digit.

868990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22 + ... + 1318.

It is an arithmetic number, because the mean of its divisors is an integer number (99297).

2⁸⁶⁸⁹⁹⁰ is an apocalyptic number.

868990 is a deficient number, since it is larger than the sum of its proper divisors (719762).

868990 is a wasteful number, since it uses less digits than its factorization.

868990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 868990 is about 932.1963312522. The cubic root of 868990 is about 95.4270707707.

The spelling of 868990 in words is "eight hundred sixty-eight thousand, nine hundred ninety".