1264689338 has 24 divisors (see below), whose sum is σ = 2087057280. Its totient is φ = 574338600.

The previous prime is 1264689337. The next prime is 1264689407. The reversal of 1264689338 is 8339864621.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1264689331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 424193 + ... + 427163.

It is an arithmetic number, because the mean of its divisors is an integer number (86960720).

Almost surely, 2^1264689338 is an apocalyptic number.

1264689338 is a deficient number, since it is larger than the sum of its proper divisors (822367942).

1264689338 is a wasteful number, since it uses less digits than its factorization.

1264689338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4754 (or 4743 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The square root of 1264689338 is about 35562.4709209020. The cubic root of 1264689338 is about 1081.4205523873.

The spelling of 1264689338 in words is "one billion, two hundred sixty-four million, six hundred eighty-nine thousand, three hundred thirty-eight".