1265438329 has 3 divisors (see below), whose sum is σ = 1265473903. Its totient is φ = 1265402756.

The previous prime is 1265438303. The next prime is 1265438341. The reversal of 1265438329 is 9238345621.

The square root of 1265438329 is 35573.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 206066025 + 1059372304 = 14355^2 + 32548^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1265438329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265438729) 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 2 ways as a sum of consecutive naturals, for example, 17787 + ... + 53359.

Almost surely, 2^1265438329 is an apocalyptic number.

1265438329 is the 35573-rd square number.

1265438329 is the 17787-th centered octagonal number.

It is an amenable number.

1265438329 is a deficient number, since it is larger than the sum of its proper divisors (35574).

1265438329 is an frugal number, since it uses more digits than its factorization.

1265438329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71146 (or 35573 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The cubic root of 1265438329 is about 1081.6339946378.

The spelling of 1265438329 in words is "one billion, two hundred sixty-five million, four hundred thirty-eight thousand, three hundred twenty-nine".