818620 has 36 divisors (see below), whose sum is σ = 1906632. Its totient is φ = 292800.

The previous prime is 818603. The next prime is 818621. The reversal of 818620 is 26818.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818621) by changing a digit.

818620 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 11 ways as a sum of consecutive naturals, for example, 13390 + ... + 13450.

It is an arithmetic number, because the mean of its divisors is an integer number (52962).

2⁸¹⁸⁶²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953316).

818620 is an abundant number, since it is smaller than the sum of its proper divisors (1088012).

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

818620 is a wasteful number, since it uses less digits than its factorization.

818620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 818620 is about 904.7762154257. The cubic root of 818620 is about 93.5464799836.

The spelling of 818620 in words is "eight hundred eighteen thousand, six hundred twenty".