1291668 has 24 divisors (see below), whose sum is σ = 3444672. Its totient is φ = 369024.

The previous prime is 1291637. The next prime is 1291669. The reversal of 1291668 is 8661921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291669) by changing a digit.

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, 7605 + ... + 7772.

It is an arithmetic number, because the mean of its divisors is an integer number (143528).

2^1291668 is an apocalyptic number.

It is an amenable number.

1291668 is an abundant number, since it is smaller than the sum of its proper divisors (2153004).

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

1291668 is a wasteful number, since it uses less digits than its factorization.

1291668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15391 (or 15389 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1291668 is about 1136.5157280038. The cubic root of 1291668 is about 108.9056220910.

The spelling of 1291668 in words is "one million, two hundred ninety-one thousand, six hundred sixty-eight".