16404681 has 8 divisors (see below), whose sum is σ = 22824000. Its totient is φ = 10460912.

The previous prime is 16404679. The next prime is 16404709. The reversal of 16404681 is 18640461.

16404681 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 16404681 - 2¹ = 16404679 is a prime.

It is a super-2 number, since 2×16404681² = 538227117423522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16404671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118806 + ... + 118943.

It is an arithmetic number, because the mean of its divisors is an integer number (2853000).

Almost surely, 2^16404681 is an apocalyptic number.

It is an amenable number.

16404681 is a deficient number, since it is larger than the sum of its proper divisors (6419319).

16404681 is a wasteful number, since it uses less digits than its factorization.

16404681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237775.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 16404681 is about 4050.2692503092. The cubic root of 16404681 is about 254.0909887505.

The spelling of 16404681 in words is "sixteen million, four hundred four thousand, six hundred eighty-one".