16806145 has 4 divisors (see below), whose sum is σ = 20167380. Its totient is φ = 13444912.

The previous prime is 16806071. The next prime is 16806173. The reversal of 16806145 is 54160861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5489649 + 11316496 = 2343^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 16806145 - 2¹³ = 16797953 is a prime.

It is a super-2 number, since 2×16806145² = 564893019522050, which contains 22 as substring.

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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1680610 + ... + 1680619.

It is an arithmetic number, because the mean of its divisors is an integer number (5041845).

Almost surely, 2^16806145 is an apocalyptic number.

It is an amenable number.

16806145 is a deficient number, since it is larger than the sum of its proper divisors (3361235).

16806145 is an equidigital number, since it uses as much as digits as its factorization.

16806145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361234.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 16806145 is about 4099.5298510927. The cubic root of 16806145 is about 256.1470560123.

The spelling of 16806145 in words is "sixteen million, eight hundred six thousand, one hundred forty-five".