1389505 has 8 divisors (see below), whose sum is σ = 1795752. Its totient is φ = 1026048.

The previous prime is 1389491. The next prime is 1389511. The reversal of 1389505 is 5059831.

1389505 = 113² + 114² + ... + 177².

It can be written as a sum of positive squares in 4 ways, for example, as 25281 + 1364224 = 159^2 + 1168^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1389505 - 2⁵ = 1389473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10624 + ... + 10753.

It is an arithmetic number, because the mean of its divisors is an integer number (224469).

2^1389505 is an apocalyptic number.

It is an amenable number.

1389505 is a deficient number, since it is larger than the sum of its proper divisors (406247).

1389505 is a wasteful number, since it uses less digits than its factorization.

1389505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21395.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1389505 is about 1178.7726668022. The cubic root of 1389505 is about 111.5886537113.

The spelling of 1389505 in words is "one million, three hundred eighty-nine thousand, five hundred five".