1231806 has 16 divisors (see below), whose sum is σ = 2476800. Its totient is φ = 408408.

The previous prime is 1231799. The next prime is 1231807. The reversal of 1231806 is 6081321.

1231806 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231807) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1005 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (154800).

2^1231806 is an apocalyptic number.

1231806 is an abundant number, since it is smaller than the sum of its proper divisors (1244994).

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

1231806 is a wasteful number, since it uses less digits than its factorization.

1231806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1231806 is about 1109.8675596665. The cubic root of 1231806 is about 107.1965409703.

The spelling of 1231806 in words is "one million, two hundred thirty-one thousand, eight hundred six".