1291040 has 24 divisors (see below), whose sum is σ = 3050460. Its totient is φ = 516352.

The previous prime is 1291021. The next prime is 1291063. The reversal of 1291040 is 401921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1056784 + 234256 = 1028^2 + 484^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3875 + ... + 4194.

2^1291040 is an apocalyptic number.

1291040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291040 is an abundant number, since it is smaller than the sum of its proper divisors (1759420).

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

1291040 is an equidigital number, since it uses as much as digits as its factorization.

1291040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8084 (or 8076 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1291040 is about 1136.2394113918. The cubic root of 1291040 is about 108.8879695111.

Adding to 1291040 its reverse (401921), we get a palindrome (1692961).

The spelling of 1291040 in words is "one million, two hundred ninety-one thousand, forty".