16403408 has 40 divisors (see below), whose sum is σ = 36580992. Its totient is φ = 6979968.

The previous prime is 16403389. The next prime is 16403417. The reversal of 16403408 is 80430461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18266 + ... + 19142.

Almost surely, 2^16403408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16403408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18290496).

16403408 is an abundant number, since it is smaller than the sum of its proper divisors (20177584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16403408 is a wasteful number, since it uses less digits than its factorization.

16403408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 16403408 is about 4050.1120972141. The cubic root of 16403408 is about 254.0844161103.

Adding to 16403408 its reverse (80430461), we get a palindrome (96833869).

The spelling of 16403408 in words is "sixteen million, four hundred three thousand, four hundred eight".