851389 has 8 divisors (see below), whose sum is σ = 1061568. Its totient is φ = 663360.

The previous prime is 851387. The next prime is 851393. The reversal of 851389 is 983158.

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

It is a cyclic number.

It is not a de Polignac number, because 851389 - 2¹ = 851387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5452 + ... + 5605.

It is an arithmetic number, because the mean of its divisors is an integer number (132696).

2⁸⁵¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

851389 is a deficient number, since it is larger than the sum of its proper divisors (210179).

851389 is a wasteful number, since it uses less digits than its factorization.

851389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11075.

The product of its digits is 8640, while the sum is 34.

The square root of 851389 is about 922.7074292537. The cubic root of 851389 is about 94.7783938963.

Subtracting 851389 from its reverse (983158), we obtain a square (131769 = 363²).

The spelling of 851389 in words is "eight hundred fifty-one thousand, three hundred eighty-nine".