16406404 has 24 divisors (see below), whose sum is σ = 33232640. Its totient is φ = 6941376.

The previous prime is 16406393. The next prime is 16406407. The reversal of 16406404 is 40460461.

It is a super-2 number, since 2×16406404² = 538340184422432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16406407) by changing a digit.

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, 1497 + ... + 5920.

Almost surely, 2^16406404 is an apocalyptic number.

16406404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16406404 is an abundant number, since it is smaller than the sum of its proper divisors (16826236).

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

16406404 is a wasteful number, since it uses less digits than its factorization.

16406404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507 (or 7505 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 16406404 is about 4050.4819466330. The cubic root of 16406404 is about 254.0998842490.

Adding to 16406404 its reverse (40460461), we get a palindrome (56866865).

The spelling of 16406404 in words is "sixteen million, four hundred six thousand, four hundred four".