1264431729 has 48 divisors (see below), whose sum is σ = 1994872320. Its totient is φ = 709209600.

The previous prime is 1264431691. The next prime is 1264431757. The reversal of 1264431729 is 9271344621.

It is not a de Polignac number, because 1264431729 - 2¹⁹ = 1263907441 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1264431769) 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, 374752 + ... + 378110.

It is an arithmetic number, because the mean of its divisors is an integer number (41559840).

Almost surely, 2^1264431729 is an apocalyptic number.

It is an amenable number.

1264431729 is a deficient number, since it is larger than the sum of its proper divisors (730440591).

1264431729 is a wasteful number, since it uses less digits than its factorization.

1264431729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3462 (or 3451 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 1264431729 is about 35558.8488143247. The cubic root of 1264431729 is about 1081.3471212881.

The spelling of 1264431729 in words is "one billion, two hundred sixty-four million, four hundred thirty-one thousand, seven hundred twenty-nine".