16440845 has 4 divisors (see below), whose sum is σ = 19729020. Its totient is φ = 13152672.

The previous prime is 16440829. The next prime is 16440847. The reversal of 16440845 is 54804461.

16440845 = 2340² + 2341² + 2342².

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 6220036 + 10220809 = 2494^2 + 3197^2 .

It is a cyclic number.

It is not a de Polignac number, because 16440845 - 2⁴ = 16440829 is a prime.

It is a super-3 number, since 3×16440845³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440847) 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, 1644080 + ... + 1644089.

It is an arithmetic number, because the mean of its divisors is an integer number (4932255).

Almost surely, 2^16440845 is an apocalyptic number.

It is an amenable number.

16440845 is a deficient number, since it is larger than the sum of its proper divisors (3288175).

16440845 is an equidigital number, since it uses as much as digits as its factorization.

16440845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3288174.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 16440845 is about 4054.7311871442. The cubic root of 16440845 is about 254.2775656276.

The spelling of 16440845 in words is "sixteen million, four hundred forty thousand, eight hundred forty-five".