1389503 has 4 divisors (see below), whose sum is σ = 1406328. Its totient is φ = 1372680.

The previous prime is 1389491. The next prime is 1389511. The reversal of 1389503 is 3059831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3059831 = 577 ⋅5303.

It is a cyclic number.

It is not a de Polignac number, because 1389503 - 2⁶ = 1389439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8288 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (351582).

2^1389503 is an apocalyptic number.

1389503 is a deficient number, since it is larger than the sum of its proper divisors (16825).

1389503 is an equidigital number, since it uses as much as digits as its factorization.

1389503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16824.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1389503 is about 1178.7718184619. The cubic root of 1389503 is about 111.5886001725.

The spelling of 1389503 in words is "one million, three hundred eighty-nine thousand, five hundred three".