1389574729 has 3 divisors (see below), whose sum is σ = 1389612007. Its totient is φ = 1389537452.

The previous prime is 1389574657. The next prime is 1389574733. The reversal of 1389574729 is 9274759831.

It is a happy number.

The square root of 1389574729 is 37277.

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: 9274759831 = 31 ⋅299185801.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 1387711504 = 1365^2 + 37252^2 .

It is not a de Polignac number, because 1389574729 - 2⁹ = 1389574217 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 1389574729.

It is not an unprimeable number, because it can be changed into a prime (1389574229) 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, 18639 + ... + 55915.

Almost surely, 2^1389574729 is an apocalyptic number.

1389574729 is the 37277-th square number.

1389574729 is the 18639-th centered octagonal number.

It is an amenable number.

1389574729 is a deficient number, since it is larger than the sum of its proper divisors (37278).

1389574729 is an frugal number, since it uses more digits than its factorization.

1389574729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74554 (or 37277 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 55.

The cubic root of 1389574729 is about 1115.9052028371.

The spelling of 1389574729 in words is "one billion, three hundred eighty-nine million, five hundred seventy-four thousand, seven hundred twenty-nine".