8181416 has 8 divisors (see below), whose sum is σ = 15340170. Its totient is φ = 4090704.

The previous prime is 8181389. The next prime is 8181421. The reversal of 8181416 is 6141818.

It can be written as a sum of positive squares in only one way, i.e., 8145316 + 36100 = 2854^2 + 190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511331 + ... + 511346.

Almost surely, 2^8181416 is an apocalyptic number.

It is an amenable number.

8181416 is a deficient number, since it is larger than the sum of its proper divisors (7158754).

8181416 is a wasteful number, since it uses less digits than its factorization.

8181416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022683 (or 1022679 counting only the distinct ones).

The product of its digits is 1536, while the sum is 29.

The square root of 8181416 is about 2860.3174648979. The cubic root of 8181416 is about 201.5005141328.

The spelling of 8181416 in words is "eight million, one hundred eighty-one thousand, four hundred sixteen".