11812503 has 4 divisors (see below), whose sum is σ = 15750008. Its totient is φ = 7875000.

The previous prime is 11812459. The next prime is 11812513. The reversal of 11812503 is 30521811.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11812503 - 2¹⁰ = 11811479 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 11812503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11812513) 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, 1968748 + ... + 1968753.

It is an arithmetic number, because the mean of its divisors is an integer number (3937502).

Almost surely, 2^11812503 is an apocalyptic number.

11812503 is a deficient number, since it is larger than the sum of its proper divisors (3937505).

11812503 is an equidigital number, since it uses as much as digits as its factorization.

11812503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937504.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 11812503 is about 3436.9322076526. The cubic root of 11812503 is about 227.7441921706.

It can be divided in two parts, 118 and 12503, that added together give a palindrome (12621).

The spelling of 11812503 in words is "eleven million, eight hundred twelve thousand, five hundred three".