11403123 has 4 divisors (see below), whose sum is σ = 15204168. Its totient is φ = 7602080.

The previous prime is 11403113. The next prime is 11403131. The reversal of 11403123 is 32130411.

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 11403123 - 2¹⁶ = 11337587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11403103) 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, 1900518 + ... + 1900523.

It is an arithmetic number, because the mean of its divisors is an integer number (3801042).

Almost surely, 2^11403123 is an apocalyptic number.

11403123 is a deficient number, since it is larger than the sum of its proper divisors (3801045).

11403123 is an equidigital number, since it uses as much as digits as its factorization.

11403123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801044.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 11403123 is about 3376.8510479439. The cubic root of 11403123 is about 225.0822612792.

Adding to 11403123 its reverse (32130411), we get a palindrome (43533534).

The spelling of 11403123 in words is "eleven million, four hundred three thousand, one hundred twenty-three".