1389038878 has 16 divisors (see below), whose sum is σ = 2109302784. Its totient is φ = 685986840.

The previous prime is 1389038857. The next prime is 1389038887. The reversal of 1389038878 is 8788309831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45613 + ... + 69703.

It is an arithmetic number, because the mean of its divisors is an integer number (131831424).

Almost surely, 2^1389038878 is an apocalyptic number.

1389038878 is a deficient number, since it is larger than the sum of its proper divisors (720263906).

1389038878 is a wasteful number, since it uses less digits than its factorization.

1389038878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24447.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The square root of 1389038878 is about 37269.8118857608. The cubic root of 1389038878 is about 1115.7617450859.

The spelling of 1389038878 in words is "one billion, three hundred eighty-nine million, thirty-eight thousand, eight hundred seventy-eight".