16404218 has 24 divisors (see below), whose sum is σ = 26491644. Its totient is φ = 7616000.

The previous prime is 16404197. The next prime is 16404229. The reversal of 16404218 is 81240461.

It can be written as a sum of positive squares in 6 ways, for example, as 16216729 + 187489 = 4027^2 + 433^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58238 + ... + 58518.

Almost surely, 2^16404218 is an apocalyptic number.

16404218 is a deficient number, since it is larger than the sum of its proper divisors (10087426).

16404218 is a wasteful number, since it uses less digits than its factorization.

16404218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 16404218 is about 4050.2120932119. The cubic root of 16404218 is about 254.0885982695.

Adding to 16404218 its reverse (81240461), we get a palindrome (97644679).

The spelling of 16404218 in words is "sixteen million, four hundred four thousand, two hundred eighteen".