859090 has 8 divisors (see below), whose sum is σ = 1546380. Its totient is φ = 343632.

The previous prime is 859081. The next prime is 859091. The reversal of 859090 is 90958.

It can be written as a sum of positive squares in 2 ways, for example, as 815409 + 43681 = 903^2 + 209^2 .

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

It is not an unprimeable number, because it can be changed into a prime (859091) by changing a digit.

859090 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 3 ways as a sum of consecutive naturals, for example, 42945 + ... + 42964.

2⁸⁵⁹⁰⁹⁰ is an apocalyptic number.

859090 is a deficient number, since it is larger than the sum of its proper divisors (687290).

859090 is a wasteful number, since it uses less digits than its factorization.

859090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85916.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 859090 is about 926.8710805716. The cubic root of 859090 is about 95.0633003793.

The spelling of 859090 in words is "eight hundred fifty-nine thousand, ninety".