16405109 has 8 divisors (see below), whose sum is σ = 18825408. Its totient is φ = 14004000.

The previous prime is 16405099. The next prime is 16405121. The reversal of 16405109 is 90150461.

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 16405109 - 2¹² = 16401013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16405139) 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, 2912 + ... + 6425.

It is an arithmetic number, because the mean of its divisors is an integer number (2353176).

Almost surely, 2^16405109 is an apocalyptic number.

It is an amenable number.

16405109 is a deficient number, since it is larger than the sum of its proper divisors (2420299).

16405109 is an equidigital number, since it uses as much as digits as its factorization.

16405109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9595.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 16405109 is about 4050.3220859581. The cubic root of 16405109 is about 254.0931984856.

The spelling of 16405109 in words is "sixteen million, four hundred five thousand, one hundred nine".