1291608396 has 48 divisors (see below), whose sum is σ = 3606204000. Its totient is φ = 397417536.

The previous prime is 1291608389. The next prime is 1291608421. The reversal of 1291608396 is 6938061921.

It is a happy number.

1291608396 is a `hidden beast` number, since 1 + 2 + 9 + 1 + 608 + 39 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458571 + ... + 461378.

It is an arithmetic number, because the mean of its divisors is an integer number (75129250).

Almost surely, 2^1291608396 is an apocalyptic number.

It is an amenable number.

1291608396 is an abundant number, since it is smaller than the sum of its proper divisors (2314595604).

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

1291608396 is a wasteful number, since it uses less digits than its factorization.

1291608396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919975 (or 919967 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1291608396 is about 35938.9537410315. The cubic root of 1291608396 is about 1089.0394691582.

The spelling of 1291608396 in words is "one billion, two hundred ninety-one million, six hundred eight thousand, three hundred ninety-six".