1389729 has 16 divisors (see below), whose sum is σ = 2110464. Its totient is φ = 805200.

The previous prime is 1389727. The next prime is 1389749. The reversal of 1389729 is 9279831.

It is not a de Polignac number, because 1389729 - 2¹ = 1389727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1389727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157 + ... + 1674.

It is an arithmetic number, because the mean of its divisors is an integer number (131904).

2^1389729 is an apocalyptic number.

It is an amenable number.

1389729 is a deficient number, since it is larger than the sum of its proper divisors (720735).

1389729 is a wasteful number, since it uses less digits than its factorization.

1389729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868.

The product of its digits is 27216, while the sum is 39.

The square root of 1389729 is about 1178.8676770529. The cubic root of 1389729 is about 111.5946497352.

The spelling of 1389729 in words is "one million, three hundred eighty-nine thousand, seven hundred twenty-nine".