1330279729 has 3 divisors (see below), whose sum is σ = 1330316203. Its totient is φ = 1330243256.

The previous prime is 1330279697. The next prime is 1330279763. The reversal of 1330279729 is 9279720331.

The square root of 1330279729 is 36473.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9279720331 = 7 ⋅1325674333.

It can be written as a sum of positive squares in only one way, i.e., 515063025 + 815216704 = 22695^2 + 28552^2 .

It is not a de Polignac number, because 1330279729 - 2⁵ = 1330279697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1330279799) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18237 + ... + 54709.

Almost surely, 2^1330279729 is an apocalyptic number.

1330279729 is the 36473-rd square number.

1330279729 is the 18237-th centered octagonal number.

It is an amenable number.

1330279729 is a deficient number, since it is larger than the sum of its proper divisors (36474).

1330279729 is an frugal number, since it uses more digits than its factorization.

1330279729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72946 (or 36473 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 43.

The cubic root of 1330279729 is about 1099.8015424342.

Multiplying 1330279729 by its product of nonzero digits (142884), we get a square (190075688798436 = 13786794²).

The spelling of 1330279729 in words is "one billion, three hundred thirty million, two hundred seventy-nine thousand, seven hundred twenty-nine".