1388503 has 4 divisors (see below), whose sum is σ = 1396440. Its totient is φ = 1380568.

The previous prime is 1388483. The next prime is 1388587. The reversal of 1388503 is 3058831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3058831 = 157 ⋅19483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388503 is a prime.

It is a Duffinian number.

1388503 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388593) 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, 3700 + ... + 4057.

It is an arithmetic number, because the mean of its divisors is an integer number (349110).

2^1388503 is an apocalyptic number.

1388503 is a deficient number, since it is larger than the sum of its proper divisors (7937).

1388503 is an equidigital number, since it uses as much as digits as its factorization.

1388503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7936.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1388503 is about 1178.3475718140. The cubic root of 1388503 is about 111.5618243204.

It can be divided in two parts, 1388 and 503, that added together give a triangular number (1891 = T₆₁).

The spelling of 1388503 in words is "one million, three hundred eighty-eight thousand, five hundred three".