1291923423 has 48 divisors (see below), whose sum is σ = 2159976000. Its totient is φ = 728870400.

The previous prime is 1291923401. The next prime is 1291923443. The reversal of 1291923423 is 3243291921.

1291923423 is a `hidden beast` number, since 129 + 192 + 342 + 3 = 666.

It is not a de Polignac number, because 1291923423 - 2⁶ = 1291923359 is a prime.

It is a super-2 number, since 2×1291923423² = 3338132261792073858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291923443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2149323 + ... + 2149923.

It is an arithmetic number, because the mean of its divisors is an integer number (44999500).

Almost surely, 2^1291923423 is an apocalyptic number.

1291923423 is a deficient number, since it is larger than the sum of its proper divisors (868052577).

1291923423 is a wasteful number, since it uses less digits than its factorization.

1291923423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 989 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1291923423 is about 35943.3362808741. The cubic root of 1291923423 is about 1089.1280019129.

The spelling of 1291923423 in words is "one billion, two hundred ninety-one million, nine hundred twenty-three thousand, four hundred twenty-three".