16449445 has 4 divisors (see below), whose sum is σ = 19739340. Its totient is φ = 13159552.

The previous prime is 16449427. The next prime is 16449449. The reversal of 16449445 is 54494461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54494461 = 7 ⋅7784923.

It can be written as a sum of positive squares in 2 ways, for example, as 12047841 + 4401604 = 3471^2 + 2098^2 .

It is a cyclic number.

It is not a de Polignac number, because 16449445 - 2⁷ = 16449317 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16449449) 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, 1644940 + ... + 1644949.

It is an arithmetic number, because the mean of its divisors is an integer number (4934835).

Almost surely, 2^16449445 is an apocalyptic number.

It is an amenable number.

16449445 is a deficient number, since it is larger than the sum of its proper divisors (3289895).

16449445 is an equidigital number, since it uses as much as digits as its factorization.

16449445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289894.

The product of its digits is 69120, while the sum is 37.

The square root of 16449445 is about 4055.7915380355. The cubic root of 16449445 is about 254.3218943687.

It can be divided in two parts, 1 and 6449445, that added together give a palindrome (6449446).

The spelling of 16449445 in words is "sixteen million, four hundred forty-nine thousand, four hundred forty-five".