1291943 has 8 divisors (see below), whose sum is σ = 1375920. Its totient is φ = 1209600.

The previous prime is 1291931. The next prime is 1291957. The reversal of 1291943 is 3491921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1291943 - 2¹⁴ = 1275559 is a prime.

It is a d-powerful number, because it can be written as 1 + 2¹⁹ + 9⁵ + 1 + 9⁶ + 4² + 3¹¹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493 + ... + 2193.

It is an arithmetic number, because the mean of its divisors is an integer number (171990).

2^1291943 is an apocalyptic number.

1291943 is a deficient number, since it is larger than the sum of its proper divisors (83977).

1291943 is an equidigital number, since it uses as much as digits as its factorization.

1291943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817.

The product of its digits is 1944, while the sum is 29.

The square root of 1291943 is about 1136.6367053725. The cubic root of 1291943 is about 108.9133503207.

The spelling of 1291943 in words is "one million, two hundred ninety-one thousand, nine hundred forty-three".