12012403 has 4 divisors (see below), whose sum is σ = 12936448. Its totient is φ = 11088360.

The previous prime is 12012367. The next prime is 12012433. The reversal of 12012403 is 30421021.

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

It is a cyclic number.

It is not a de Polignac number, because 12012403 - 2¹³ = 12004211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 924031 = 12012403 / (1 + 2 + 0 + 1 + 2 + 4 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12012433) 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, 462003 + ... + 462028.

It is an arithmetic number, because the mean of its divisors is an integer number (3234112).

Almost surely, 2^12012403 is an apocalyptic number.

12012403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12012403 is a deficient number, since it is larger than the sum of its proper divisors (924045).

12012403 is an equidigital number, since it uses as much as digits as its factorization.

12012403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924044.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 12012403 is about 3465.8913716388. The cubic root of 12012403 is about 229.0216985217.

Adding to 12012403 its reverse (30421021), we get a palindrome (42433424).

It can be divided in two parts, 1201 and 2403, that multiplied together give a triangular number (2886003 = T₂₄₀₂).

The spelling of 12012403 in words is "twelve million, twelve thousand, four hundred three".