16404992 has 30 divisors (see below), whose sum is σ = 32962083. Its totient is φ = 8156672.

The previous prime is 16404989. The next prime is 16405007. The reversal of 16404992 is 29940461.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

16404992 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in only one way, i.e., 8202496 + 8202496 = 2864^2 + 2864^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2864.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 91559 + ... + 91737.

Almost surely, 2^16404992 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 16404992

16404992 is an abundant number, since it is smaller than the sum of its proper divisors (16557091).

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

16404992 is an frugal number, since it uses more digits than its factorization.

16404992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 16404992 is about 4050.3076426365. The cubic root of 16404992 is about 254.0925944263.

The spelling of 16404992 in words is "sixteen million, four hundred four thousand, nine hundred ninety-two".