1291768 has 8 divisors (see below), whose sum is σ = 2422080. Its totient is φ = 645880.

The previous prime is 1291691. The next prime is 1291783. The reversal of 1291768 is 8671921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 80728 + ... + 80743.

It is an arithmetic number, because the mean of its divisors is an integer number (302760).

2^1291768 is an apocalyptic number.

It is an amenable number.

1291768 is a deficient number, since it is larger than the sum of its proper divisors (1130312).

1291768 is a wasteful number, since it uses less digits than its factorization.

1291768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161477 (or 161473 counting only the distinct ones).

The product of its digits is 6048, while the sum is 34.

The square root of 1291768 is about 1136.5597212641. The cubic root of 1291768 is about 108.9084324832.

The spelling of 1291768 in words is "one million, two hundred ninety-one thousand, seven hundred sixty-eight".