1247040 has 84 divisors (see below), whose sum is σ = 4299204. Its totient is φ = 331776.

The previous prime is 1247033. The next prime is 1247053. The reversal of 1247040 is 407421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 968256 = 528^2 + 984^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2664 + ... + 3096.

It is an arithmetic number, because the mean of its divisors is an integer number (51181).

2^1247040 is an apocalyptic number.

1247040 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 1247040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2149602).

1247040 is an abundant number, since it is smaller than the sum of its proper divisors (3052164).

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

1247040 is a wasteful number, since it uses less digits than its factorization.

1247040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1247040 is about 1116.7094519167. The cubic root of 1247040 is about 107.6366389417.

The spelling of 1247040 in words is "one million, two hundred forty-seven thousand, forty".