1232840 has 96 divisors (see below), whose sum is σ = 3508920. Its totient is φ = 387072.

The previous prime is 1232831. The next prime is 1232843. The reversal of 1232840 is 482321.

It can be written as a sum of positive squares in 4 ways, for example, as 1223236 + 9604 = 1106^2 + 98^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232843) 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 23 ways as a sum of consecutive naturals, for example, 33302 + ... + 33338.

2^1232840 is an apocalyptic number.

1232840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1232840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1754460).

1232840 is an abundant number, since it is smaller than the sum of its proper divisors (2276080).

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

1232840 is a wasteful number, since it uses less digits than its factorization.

1232840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1232840 is about 1110.3332832983. Note that the first 3 decimals coincide. The cubic root of 1232840 is about 107.2265268132.

The spelling of 1232840 in words is "one million, two hundred thirty-two thousand, eight hundred forty".