16405117 has 4 divisors (see below), whose sum is σ = 16413856. Its totient is φ = 16396380.

The previous prime is 16405099. The next prime is 16405121. The reversal of 16405117 is 71150461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 71150461 = 61 ⋅1166401.

It is a cyclic number.

It is not a de Polignac number, because 16405117 - 2⁷ = 16404989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16405091 and 16405100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16435117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273 + ... + 5734.

It is an arithmetic number, because the mean of its divisors is an integer number (4103464).

Almost surely, 2^16405117 is an apocalyptic number.

It is an amenable number.

16405117 is a deficient number, since it is larger than the sum of its proper divisors (8739).

16405117 is an equidigital number, since it uses as much as digits as its factorization.

16405117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8738.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 16405117 is about 4050.3230735338. The cubic root of 16405117 is about 254.0932397887.

Adding to 16405117 its reverse (71150461), we get a palindrome (87555578).

The spelling of 16405117 in words is "sixteen million, four hundred five thousand, one hundred seventeen".