331806 has 16 divisors (see below), whose sum is σ = 702864. Its totient is φ = 104064.

The previous prime is 331801. The next prime is 331819. The reversal of 331806 is 608133.

It is a super-2 number, since 2×331806² = 220190443272, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331806.

It is not an unprimeable number, because it can be changed into a prime (331801) by changing a digit.

331806 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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1525 + ... + 1728.

It is an arithmetic number, because the mean of its divisors is an integer number (43929).

331806 is a Friedman number, since it can be written as (10+(8*6)^3)*3, using all its digits and the basic arithmetic operations.

2³³¹⁸⁰⁶ is an apocalyptic number.

331806 is an abundant number, since it is smaller than the sum of its proper divisors (371058).

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

331806 is a wasteful number, since it uses less digits than its factorization.

331806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3275.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 331806 is about 576.0260410780. The cubic root of 331806 is about 69.2300658998.

Adding to 331806 its reverse (608133), we get a palindrome (939939).

The spelling of 331806 in words is "three hundred thirty-one thousand, eight hundred six".