16806865 has 4 divisors (see below), whose sum is σ = 20168244. Its totient is φ = 13445488.

The previous prime is 16806833. The next prime is 16806869. The reversal of 16806865 is 56860861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56860861 = 1187 ⋅47903.

It can be written as a sum of positive squares in 2 ways, for example, as 3564544 + 13242321 = 1888^2 + 3639^2 .

It is a cyclic number.

It is not a de Polignac number, because 16806865 - 2⁵ = 16806833 is a prime.

It is a super-2 number, since 2×16806865² = 564941422256450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16806869) 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, 1680682 + ... + 1680691.

It is an arithmetic number, because the mean of its divisors is an integer number (5042061).

Almost surely, 2^16806865 is an apocalyptic number.

It is an amenable number.

16806865 is a deficient number, since it is larger than the sum of its proper divisors (3361379).

16806865 is an equidigital number, since it uses as much as digits as its factorization.

16806865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361378.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 16806865 is about 4099.6176651000. The cubic root of 16806865 is about 256.1507138657.

It can be divided in two parts, 16806 and 865, that added together give a palindrome (17671).

The spelling of 16806865 in words is "sixteen million, eight hundred six thousand, eight hundred sixty-five".