16243645 has 12 divisors (see below), whose sum is σ = 21426300. Its totient is φ = 11813120.

The previous prime is 16243609. The next prime is 16243649. The reversal of 16243645 is 54634261.

It can be written as a sum of positive squares in 2 ways, for example, as 5134756 + 11108889 = 2266^2 + 3333^2 .

It is not a de Polignac number, because 16243645 - 2⁹ = 16243133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16243649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12820 + ... + 14029.

It is an arithmetic number, because the mean of its divisors is an integer number (1785525).

Almost surely, 2^16243645 is an apocalyptic number.

It is an amenable number.

16243645 is a deficient number, since it is larger than the sum of its proper divisors (5182655).

16243645 is a wasteful number, since it uses less digits than its factorization.

16243645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26876 (or 26865 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 16243645 is about 4030.3405563302. The cubic root of 16243645 is about 253.2568280447.

The spelling of 16243645 in words is "sixteen million, two hundred forty-three thousand, six hundred forty-five".