16404123 has 4 divisors (see below), whose sum is σ = 21872168. Its totient is φ = 10936080.

The previous prime is 16404109. The next prime is 16404127. The reversal of 16404123 is 32140461.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16404123 - 2¹⁷ = 16273051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16404123.

It is not an unprimeable number, because it can be changed into a prime (16404127) 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, 2734018 + ... + 2734023.

It is an arithmetic number, because the mean of its divisors is an integer number (5468042).

Almost surely, 2^16404123 is an apocalyptic number.

16404123 is a deficient number, since it is larger than the sum of its proper divisors (5468045).

16404123 is an equidigital number, since it uses as much as digits as its factorization.

16404123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468044.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 16404123 is about 4050.2003654140. The cubic root of 16404123 is about 254.0881077765.

Adding to 16404123 its reverse (32140461), we get a palindrome (48544584).

The spelling of 16404123 in words is "sixteen million, four hundred four thousand, one hundred twenty-three".