16581416 has 16 divisors (see below), whose sum is σ = 31143840. Its totient is φ = 8276400.

The previous prime is 16581403. The next prime is 16581431. The reversal of 16581416 is 61418561.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4391 + ... + 7241.

It is an arithmetic number, because the mean of its divisors is an integer number (1946490).

Almost surely, 2^16581416 is an apocalyptic number.

It is an amenable number.

16581416 is a deficient number, since it is larger than the sum of its proper divisors (14562424).

16581416 is a wasteful number, since it uses less digits than its factorization.

16581416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584 (or 3580 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 16581416 is about 4072.0284871302. The cubic root of 16581416 is about 255.0002101754. Note that the first 3 decimals are identical.

Adding to 16581416 its reverse (61418561), we get a palindrome (77999977).

The spelling of 16581416 in words is "sixteen million, five hundred eighty-one thousand, four hundred sixteen".