16406505 has 24 divisors (see below), whose sum is σ = 28536768. Its totient is φ = 8719776.

The previous prime is 16406501. The next prime is 16406563. The reversal of 16406505 is 50560461.

It is a happy number.

16406505 is a `hidden beast` number, since 1 + 6 + 4 + 0 + 650 + 5 = 666.

It is not a de Polignac number, because 16406505 - 2² = 16406501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16406501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19524 + ... + 20346.

It is an arithmetic number, because the mean of its divisors is an integer number (1189032).

Almost surely, 2^16406505 is an apocalyptic number.

16406505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16406505 is a deficient number, since it is larger than the sum of its proper divisors (12130263).

16406505 is a wasteful number, since it uses less digits than its factorization.

16406505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 16406505 is about 4050.4944142660. The cubic root of 16406505 is about 254.1004056722.

Adding to 16406505 its reverse (50560461), we get a palindrome (66966966).

The spelling of 16406505 in words is "sixteen million, four hundred six thousand, five hundred five".