851818 has 16 divisors (see below), whose sum is σ = 1440000. Its totient is φ = 374400.

The previous prime is 851813. The next prime is 851821. The reversal of 851818 is 818158.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 851818.

It is not an unprimeable number, because it can be changed into a prime (851813) 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, 58 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (90000).

2⁸⁵¹⁸¹⁸ is an apocalyptic number.

851818 is a deficient number, since it is larger than the sum of its proper divisors (588182).

851818 is a wasteful number, since it uses less digits than its factorization.

851818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293.

The product of its digits is 2560, while the sum is 31.

The square root of 851818 is about 922.9398680304. The cubic root of 851818 is about 94.7943102806.

The spelling of 851818 in words is "eight hundred fifty-one thousand, eight hundred eighteen".