1231800 has 48 divisors (see below), whose sum is σ = 3820440. Its totient is φ = 328320.

The previous prime is 1231799. The next prime is 1231807. The reversal of 1231800 is 81321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1231800.

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 (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 427 + ... + 1626.

2^1231800 is an apocalyptic number.

1231800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231800 is an abundant number, since it is smaller than the sum of its proper divisors (2588640).

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

1231800 is a wasteful number, since it uses less digits than its factorization.

1231800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072 (or 2063 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1231800 is about 1109.8648566380. The cubic root of 1231800 is about 107.1963669222.

The spelling of 1231800 in words is "one million, two hundred thirty-one thousand, eight hundred".