2278403 has 12 divisors (see below), whose sum is σ = 2455320. Its totient is φ = 2113056.

The previous prime is 2278379. The next prime is 2278421. The reversal of 2278403 is 3048722.

It is not a de Polignac number, because 2278403 - 2²⁰ = 1229827 is a prime.

It is a super-2 number, since 2×2278403² = 10382240460818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2278453) 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 11 ways as a sum of consecutive naturals, for example, 31175 + ... + 31247.

It is an arithmetic number, because the mean of its divisors is an integer number (204610).

2^2278403 is an apocalyptic number.

2278403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2278403 is a deficient number, since it is larger than the sum of its proper divisors (176917).

2278403 is an equidigital number, since it uses as much as digits as its factorization.

2278403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 2278403 is about 1509.4379748767. The cubic root of 2278403 is about 131.5861502780.

The spelling of 2278403 in words is "two million, two hundred seventy-eight thousand, four hundred three".