1291923424 has 24 divisors (see below), whose sum is σ = 2774699928. Its totient is φ = 587237760.

The previous prime is 1291923401. The next prime is 1291923443. The reversal of 1291923424 is 4243291921.

It is a super-2 number, since 2×1291923424² = 3338132266959767552, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 1834767 + ... + 1835470.

It is an arithmetic number, because the mean of its divisors is an integer number (115612497).

Almost surely, 2^1291923424 is an apocalyptic number.

It is an amenable number.

1291923424 is an abundant number, since it is smaller than the sum of its proper divisors (1482776504).

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

1291923424 is a wasteful number, since it uses less digits than its factorization.

1291923424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670258 (or 3670250 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 1291923424 is about 35943.3362947849. The cubic root of 1291923424 is about 1089.1280021939.

The spelling of 1291923424 in words is "one billion, two hundred ninety-one million, nine hundred twenty-three thousand, four hundred twenty-four".