1206503 has 4 divisors (see below), whose sum is σ = 1223568. Its totient is φ = 1189440.

The previous prime is 1206497. The next prime is 1206529. The reversal of 1206503 is 3056021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3056021 = 401 ⋅7621.

It is a cyclic number.

It is not a de Polignac number, because 1206503 - 2¹⁶ = 1140967 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 (1206553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8426 + ... + 8567.

It is an arithmetic number, because the mean of its divisors is an integer number (305892).

2^1206503 is an apocalyptic number.

1206503 is a deficient number, since it is larger than the sum of its proper divisors (17065).

1206503 is an equidigital number, since it uses as much as digits as its factorization.

1206503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17064.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 1206503 is about 1098.4093044034. The cubic root of 1206503 is about 106.4574686718.

The spelling of 1206503 in words is "one million, two hundred six thousand, five hundred three".