16290805 has 4 divisors (see below), whose sum is σ = 19548972. Its totient is φ = 13032640.

The previous prime is 16290793. The next prime is 16290821. The reversal of 16290805 is 50809261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50809261 = 4679 ⋅10859.

It can be written as a sum of positive squares in 2 ways, for example, as 4635409 + 11655396 = 2153^2 + 3414^2 .

It is not a de Polignac number, because 16290805 - 2⁵ = 16290773 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1629076 + ... + 1629085.

It is an arithmetic number, because the mean of its divisors is an integer number (4887243).

Almost surely, 2^16290805 is an apocalyptic number.

It is an amenable number.

16290805 is a deficient number, since it is larger than the sum of its proper divisors (3258167).

16290805 is an equidigital number, since it uses as much as digits as its factorization.

16290805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258166.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 16290805 is about 4036.1869381881. The cubic root of 16290805 is about 253.5016838442.

The spelling of 16290805 in words is "sixteen million, two hundred ninety thousand, eight hundred five".