1243040 has 48 divisors (see below), whose sum is σ = 3116232. Its totient is φ = 466944.

The previous prime is 1243013. The next prime is 1243093. The reversal of 1243040 is 403421.

It can be written as a sum of positive squares in 4 ways, for example, as 1227664 + 15376 = 1108^2 + 124^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2492 + ... + 2948.

2^1243040 is an apocalyptic number.

1243040 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 1243040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1558116).

1243040 is an abundant number, since it is smaller than the sum of its proper divisors (1873192).

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

1243040 is a wasteful number, since it uses less digits than its factorization.

1243040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 1243040 is about 1114.9170372723. The cubic root of 1243040 is about 107.5214307373.

Adding to 1243040 its reverse (403421), we get a palindrome (1646461).

The spelling of 1243040 in words is "one million, two hundred forty-three thousand, forty".