2123403 has 4 divisors (see below), whose sum is σ = 2831208. Its totient is φ = 1415600.

The previous prime is 2123377. The next prime is 2123411. The reversal of 2123403 is 3043212.

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 2123403 - 2¹² = 2119307 is a prime.

It is a d-powerful number, because it can be written as 2 + 1 + 2²¹ + 3⁸ + 4 + 0 + 3⁹ .

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2123423) 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, 353898 + ... + 353903.

It is an arithmetic number, because the mean of its divisors is an integer number (707802).

2^2123403 is an apocalyptic number.

2123403 is a deficient number, since it is larger than the sum of its proper divisors (707805).

2123403 is an equidigital number, since it uses as much as digits as its factorization.

2123403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707804.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 2123403 is about 1457.1901042760. The cubic root of 2123403 is about 128.5318648991.

Adding to 2123403 its reverse (3043212), we get a palindrome (5166615).

The spelling of 2123403 in words is "two million, one hundred twenty-three thousand, four hundred three".