1291408 has 10 divisors (see below), whose sum is σ = 2502134. Its totient is φ = 645696.

The previous prime is 1291391. The next prime is 1291421. The reversal of 1291408 is 8041921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 725904 + 565504 = 852^2 + 752^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40341 + ... + 40372.

2^1291408 is an apocalyptic number.

It is an amenable number.

1291408 is a deficient number, since it is larger than the sum of its proper divisors (1210726).

1291408 is an equidigital number, since it uses as much as digits as its factorization.

1291408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80721 (or 80715 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1291408 is about 1136.4013375564. The cubic root of 1291408 is about 108.8983143923.

The spelling of 1291408 in words is "one million, two hundred ninety-one thousand, four hundred eight".