1389905 has 16 divisors (see below), whose sum is σ = 1871424. Its totient is φ = 982080.

The previous prime is 1389893. The next prime is 1389911. The reversal of 1389905 is 5099831.

It is not a de Polignac number, because 1389905 - 2⁶ = 1389841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1694 + ... + 2376.

It is an arithmetic number, because the mean of its divisors is an integer number (116964).

2^1389905 is an apocalyptic number.

It is an amenable number.

1389905 is a deficient number, since it is larger than the sum of its proper divisors (481519).

1389905 is a wasteful number, since it uses less digits than its factorization.

1389905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1389905 is about 1178.9423225926. The cubic root of 1389905 is about 111.5993604448.

The spelling of 1389905 in words is "one million, three hundred eighty-nine thousand, nine hundred five".