1291744 has 24 divisors (see below), whose sum is σ = 2614248. Its totient is φ = 627840.

The previous prime is 1291691. The next prime is 1291783. The reversal of 1291744 is 4471921.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 639 + ... + 1729.

It is an arithmetic number, because the mean of its divisors is an integer number (108927).

2^1291744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1307124).

1291744 is an abundant number, since it is smaller than the sum of its proper divisors (1322504).

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

1291744 is a wasteful number, since it uses less digits than its factorization.

1291744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138 (or 1130 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 1291744 is about 1136.5491630370. The cubic root of 1291744 is about 108.9077580023.

The spelling of 1291744 in words is "one million, two hundred ninety-one thousand, seven hundred forty-four".