851923 has 4 divisors (see below), whose sum is σ = 855360. Its totient is φ = 848488.

The previous prime is 851899. The next prime is 851953. The reversal of 851923 is 329158.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 851923 - 2⁵ = 851891 is a prime.

It is a Duffinian number.

851923 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 851891 and 851900.

It is not an unprimeable number, because it can be changed into a prime (851953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1315 + ... + 1852.

It is an arithmetic number, because the mean of its divisors is an integer number (213840).

2⁸⁵¹⁹²³ is an apocalyptic number.

851923 is a deficient number, since it is larger than the sum of its proper divisors (3437).

851923 is a wasteful number, since it uses less digits than its factorization.

851923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436.

The product of its digits is 2160, while the sum is 28.

The square root of 851923 is about 922.9967497234. The cubic root of 851923 is about 94.7982050851.

The spelling of 851923 in words is "eight hundred fifty-one thousand, nine hundred twenty-three".