16408538 has 8 divisors (see below), whose sum is σ = 25278132. Its totient is φ = 7982496.

The previous prime is 16408529. The next prime is 16408543. The reversal of 16408538 is 83580461.

It can be written as a sum of positive squares in 2 ways, for example, as 13741849 + 2666689 = 3707^2 + 1633^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 16408498 and 16408507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110795 + ... + 110942.

Almost surely, 2^16408538 is an apocalyptic number.

16408538 is a deficient number, since it is larger than the sum of its proper divisors (8869594).

16408538 is a wasteful number, since it uses less digits than its factorization.

16408538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221776.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 16408538 is about 4050.7453635103. The cubic root of 16408538 is about 254.1109007936.

Adding to 16408538 its reverse (83580461), we get a palindrome (99988999).

The spelling of 16408538 in words is "sixteen million, four hundred eight thousand, five hundred thirty-eight".