850389 has 4 divisors (see below), whose sum is σ = 1133856. Its totient is φ = 566924.

The previous prime is 850387. The next prime is 850393. The reversal of 850389 is 983058.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 850389 - 2¹ = 850387 is a prime.

It is a super-2 number, since 2×850389² = 1446322902642, which contains 22 as substring.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

850389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (850387) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 141729 + ... + 141734.

It is an arithmetic number, because the mean of its divisors is an integer number (283464).

2⁸⁵⁰³⁸⁹ is an apocalyptic number.

It is an amenable number.

850389 is a deficient number, since it is larger than the sum of its proper divisors (283467).

850389 is a wasteful number, since it uses less digits than its factorization.

850389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283466.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 850389 is about 922.1653864682. The cubic root of 850389 is about 94.7412719988.

The spelling of 850389 in words is "eight hundred fifty thousand, three hundred eighty-nine".