1389013879 has 4 divisors (see below), whose sum is σ = 1515287880. Its totient is φ = 1262739880.

The previous prime is 1389013837. The next prime is 1389013903. The reversal of 1389013879 is 9783109831.

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

It is a cyclic number.

It is not a de Polignac number, because 1389013879 - 2⁷ = 1389013751 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389013279) 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, 63136984 + ... + 63137005.

It is an arithmetic number, because the mean of its divisors is an integer number (378821970).

Almost surely, 2^1389013879 is an apocalyptic number.

1389013879 is a deficient number, since it is larger than the sum of its proper divisors (126274001).

1389013879 is a wasteful number, since it uses less digits than its factorization.

1389013879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126274000.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 1389013879 is about 37269.4765055803. The cubic root of 1389013879 is about 1115.7550514659.

The spelling of 1389013879 in words is "one billion, three hundred eighty-nine million, thirteen thousand, eight hundred seventy-nine".