1389685 has 12 divisors (see below), whose sum is σ = 1833804. Its totient is φ = 1010240.

The previous prime is 1389677. The next prime is 1389697. The reversal of 1389685 is 5869831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 576081 + 813604 = 759^2 + 902^2 .

It is not a de Polignac number, because 1389685 - 2³ = 1389677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 544 + ... + 1753.

It is an arithmetic number, because the mean of its divisors is an integer number (152817).

2^1389685 is an apocalyptic number.

It is an amenable number.

1389685 is a deficient number, since it is larger than the sum of its proper divisors (444119).

1389685 is a wasteful number, since it uses less digits than its factorization.

1389685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324 (or 2313 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 1389685 is about 1178.8490149294. The cubic root of 1389685 is about 111.5934719956.

It can be divided in two parts, 13 and 89685, that added together give a palindrome (89698).

The spelling of 1389685 in words is "one million, three hundred eighty-nine thousand, six hundred eighty-five".