1389557 has 8 divisors (see below), whose sum is σ = 1514520. Its totient is φ = 1267200.

The previous prime is 1389551. The next prime is 1389559. The reversal of 1389557 is 7559831.

It can be written as a sum of positive squares in 4 ways, for example, as 155236 + 1234321 = 394^2 + 1111^2 .

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 1389557 - 2⁸ = 1389301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1389557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557 + ... + 1757.

It is an arithmetic number, because the mean of its divisors is an integer number (189315).

2^1389557 is an apocalyptic number.

It is an amenable number.

1389557 is a deficient number, since it is larger than the sum of its proper divisors (124963).

1389557 is a wasteful number, since it uses less digits than its factorization.

1389557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303.

The product of its digits is 37800, while the sum is 38.

The square root of 1389557 is about 1178.7947234358. The cubic root of 1389557 is about 111.5900457028.

It can be divided in two parts, 13 and 89557, that multiplied together give a square (1164241 = 1079²).

The spelling of 1389557 in words is "one million, three hundred eighty-nine thousand, five hundred fifty-seven".