2491403 has 4 divisors (see below), whose sum is σ = 2497248. Its totient is φ = 2485560.

The previous prime is 2491397. The next prime is 2491453. The reversal of 2491403 is 3041942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3041942 = 2 ⋅1520971.

It is a cyclic number.

It is not a de Polignac number, because 2491403 - 2⁴ = 2491387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2491453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2228 + ... + 3153.

It is an arithmetic number, because the mean of its divisors is an integer number (624312).

2^2491403 is an apocalyptic number.

2491403 is a deficient number, since it is larger than the sum of its proper divisors (5845).

2491403 is an equidigital number, since it uses as much as digits as its factorization.

2491403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5844.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 2491403 is about 1578.4178787634. The cubic root of 2491403 is about 135.5651298392.

The spelling of 2491403 in words is "two million, four hundred ninety-one thousand, four hundred three".