1231808 has 28 divisors (see below), whose sum is σ = 2575560. Its totient is φ = 582912.

The previous prime is 1231807. The next prime is 1231817. The reversal of 1231808 is 8081321.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710 + ... + 1722.

2^1231808 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 1231808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287780).

1231808 is an abundant number, since it is smaller than the sum of its proper divisors (1343752).

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

1231808 is a wasteful number, since it uses less digits than its factorization.

1231808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044 (or 1034 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1231808 is about 1109.8684606745. The cubic root of 1231808 is about 107.1965989862.

The spelling of 1231808 in words is "one million, two hundred thirty-one thousand, eight hundred eight".