16403123 has 12 divisors (see below), whose sum is σ = 18615744. Its totient is φ = 14427600.

The previous prime is 16403119. The next prime is 16403131. The reversal of 16403123 is 32130461.

It is not a de Polignac number, because 16403123 - 2² = 16403119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16403095 and 16403104.

It is not an unprimeable number, because it can be changed into a prime (16403143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1565 + ... + 5937.

It is an arithmetic number, because the mean of its divisors is an integer number (1551312).

Almost surely, 2^16403123 is an apocalyptic number.

16403123 is a deficient number, since it is larger than the sum of its proper divisors (2212621).

16403123 is a wasteful number, since it uses less digits than its factorization.

16403123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426 (or 4415 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 16403123 is about 4050.0769128499. The cubic root of 16403123 is about 254.0829445772.

Adding to 16403123 its reverse (32130461), we get a palindrome (48533584).

The spelling of 16403123 in words is "sixteen million, four hundred three thousand, one hundred twenty-three".