16409903 has 4 divisors (see below), whose sum is σ = 16493400. Its totient is φ = 16326408.

The previous prime is 16409893. The next prime is 16409929. The reversal of 16409903 is 30990461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30990461 = 1163 ⋅26647.

It is a cyclic number.

It is not a de Polignac number, because 16409903 - 2⁶ = 16409839 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 16409903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16409933) 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, 41453 + ... + 41846.

It is an arithmetic number, because the mean of its divisors is an integer number (4123350).

Almost surely, 2^16409903 is an apocalyptic number.

16409903 is a deficient number, since it is larger than the sum of its proper divisors (83497).

16409903 is an equidigital number, since it uses as much as digits as its factorization.

16409903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83496.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 16409903 is about 4050.9138475164. The cubic root of 16409903 is about 254.1179469579.

The spelling of 16409903 in words is "sixteen million, four hundred nine thousand, nine hundred three".