1264399333 has 4 divisors (see below), whose sum is σ = 1307999340. Its totient is φ = 1220799328.

The previous prime is 1264399321. The next prime is 1264399337. The reversal of 1264399333 is 3339934621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 242829889 + 1021569444 = 15583^2 + 31962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264399333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1264399333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264399337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21799960 + ... + 21800017.

It is an arithmetic number, because the mean of its divisors is an integer number (326999835).

Almost surely, 2^1264399333 is an apocalyptic number.

It is an amenable number.

1264399333 is a deficient number, since it is larger than the sum of its proper divisors (43600007).

1264399333 is an equidigital number, since it uses as much as digits as its factorization.

1264399333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43600006.

The product of its digits is 314928, while the sum is 43.

The square root of 1264399333 is about 35558.3932848491. The cubic root of 1264399333 is about 1081.3378861459.

The spelling of 1264399333 in words is "one billion, two hundred sixty-four million, three hundred ninety-nine thousand, three hundred thirty-three".