1389025139 has 4 divisors (see below), whose sum is σ = 1390905480. Its totient is φ = 1387144800.

The previous prime is 1389025123. The next prime is 1389025181. The reversal of 1389025139 is 9315209831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9315209831 = 89 ⋅104665279.

It is a cyclic number.

It is not a de Polignac number, because 1389025139 - 2⁴ = 1389025123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1389025096 and 1389025105.

It is not an unprimeable number, because it can be changed into a prime (1389025109) 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, 939062 + ... + 940539.

It is an arithmetic number, because the mean of its divisors is an integer number (347726370).

Almost surely, 2^1389025139 is an apocalyptic number.

1389025139 is a deficient number, since it is larger than the sum of its proper divisors (1880341).

1389025139 is an equidigital number, since it uses as much as digits as its factorization.

1389025139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880340.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 1389025139 is about 37269.6275672296. The cubic root of 1389025139 is about 1115.7580664028.

The spelling of 1389025139 in words is "one billion, three hundred eighty-nine million, twenty-five thousand, one hundred thirty-nine".