850890 has 32 divisors (see below), whose sum is σ = 2068416. Its totient is φ = 224000.

The previous prime is 850879. The next prime is 850891. The reversal of 850890 is 98058.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (850891) by changing a digit.

850890 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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3265 + ... + 3515.

It is an arithmetic number, because the mean of its divisors is an integer number (64638).

2⁸⁵⁰⁸⁹⁰ is an apocalyptic number.

850890 is an abundant number, since it is smaller than the sum of its proper divisors (1217526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

850890 is a wasteful number, since it uses less digits than its factorization.

850890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 850890 is about 922.4369897180. The cubic root of 850890 is about 94.7598737050.

Subtracting from 850890 its sum of digits (30), we obtain a triangular number (850860 = T₁₃₀₄).

The spelling of 850890 in words is "eight hundred fifty thousand, eight hundred ninety".