1215403 has 4 divisors (see below), whose sum is σ = 1389040. Its totient is φ = 1041768.

The previous prime is 1215397. The next prime is 1215407. The reversal of 1215403 is 3045121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3045121 = 97 ⋅31393.

It is not a de Polignac number, because 1215403 - 2⁹ = 1214891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215407) 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, 86808 + ... + 86821.

It is an arithmetic number, because the mean of its divisors is an integer number (347260).

2^1215403 is an apocalyptic number.

1215403 is a deficient number, since it is larger than the sum of its proper divisors (173637).

1215403 is an equidigital number, since it uses as much as digits as its factorization.

1215403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173636.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1215403 is about 1102.4531736087. The cubic root of 1215403 is about 106.7185955919.

The spelling of 1215403 in words is "one million, two hundred fifteen thousand, four hundred three".