1389520744 has 8 divisors (see below), whose sum is σ = 2605351410. Its totient is φ = 694760368.

The previous prime is 1389520729. The next prime is 1389520751. The reversal of 1389520744 is 4470259831.

It can be written as a sum of positive squares in only one way, i.e., 810540900 + 578979844 = 28470^2 + 24062^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1389520744.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86845039 + ... + 86845054.

Almost surely, 2^1389520744 is an apocalyptic number.

It is an amenable number.

1389520744 is a deficient number, since it is larger than the sum of its proper divisors (1215830666).

1389520744 is a wasteful number, since it uses less digits than its factorization.

1389520744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173690099 (or 173690095 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1389520744 is about 37276.2758869499. The cubic root of 1389520744 is about 1115.8907516717.

The spelling of 1389520744 in words is "one billion, three hundred eighty-nine million, five hundred twenty thousand, seven hundred forty-four".