16404691 has 8 divisors (see below), whose sum is σ = 17031600. Its totient is φ = 15781920.

The previous prime is 16404679. The next prime is 16404709. The reversal of 16404691 is 19640461.

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

It is a cyclic number.

It is not a de Polignac number, because 16404691 - 2⁵ = 16404659 is a prime.

It is a super-2 number, since 2×16404691² = 538227773610962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16404671) 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, 8745 + ... + 10453.

It is an arithmetic number, because the mean of its divisors is an integer number (2128950).

Almost surely, 2^16404691 is an apocalyptic number.

16404691 is a deficient number, since it is larger than the sum of its proper divisors (626909).

16404691 is a wasteful number, since it uses less digits than its factorization.

16404691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 16404691 is about 4050.2704847948. The cubic root of 16404691 is about 254.0910403803.

The spelling of 16404691 in words is "sixteen million, four hundred four thousand, six hundred ninety-one".