1389944039 has 4 divisors (see below), whose sum is σ = 1516302600. Its totient is φ = 1263585480.

The previous prime is 1389943963. The next prime is 1389944047. The reversal of 1389944039 is 9304499831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389944039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389944099) 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, 63179264 + ... + 63179285.

It is an arithmetic number, because the mean of its divisors is an integer number (379075650).

Almost surely, 2^1389944039 is an apocalyptic number.

1389944039 is a deficient number, since it is larger than the sum of its proper divisors (126358561).

1389944039 is a wasteful number, since it uses less digits than its factorization.

1389944039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126358560.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 1389944039 is about 37281.9532615983. The cubic root of 1389944039 is about 1116.0040528516.

The spelling of 1389944039 in words is "one billion, three hundred eighty-nine million, nine hundred forty-four thousand, thirty-nine".