1389878855 has 4 divisors (see below), whose sum is σ = 1667854632. Its totient is φ = 1111903080.

The previous prime is 1389878851. The next prime is 1389878879. The reversal of 1389878855 is 5588789831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5588789831 = 17 ⋅328752343.

It is not a de Polignac number, because 1389878855 - 2² = 1389878851 is a prime.

It is a super-2 number, since 2×1389878855² = 3863526463152222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389878851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138987881 + ... + 138987890.

It is an arithmetic number, because the mean of its divisors is an integer number (416963658).

Almost surely, 2^1389878855 is an apocalyptic number.

1389878855 is a deficient number, since it is larger than the sum of its proper divisors (277975777).

1389878855 is an equidigital number, since it uses as much as digits as its factorization.

1389878855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277975776.

The product of its digits is 19353600, while the sum is 62.

The square root of 1389878855 is about 37281.0790482250. The cubic root of 1389878855 is about 1115.9866068865.

The spelling of 1389878855 in words is "one billion, three hundred eighty-nine million, eight hundred seventy-eight thousand, eight hundred fifty-five".