8181850 has 12 divisors (see below), whose sum is σ = 15218334. Its totient is φ = 3272720.

The previous prime is 8181841. The next prime is 8181851. The reversal of 8181850 is 581818.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6661561 + 1520289 = 2581^2 + 1233^2 .

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

It is not an unprimeable number, because it can be changed into a prime (8181851) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 81769 + ... + 81868.

Almost surely, 2^8181850 is an apocalyptic number.

8181850 is a deficient number, since it is larger than the sum of its proper divisors (7036484).

8181850 is a wasteful number, since it uses less digits than its factorization.

8181850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163649 (or 163644 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 8181850 is about 2860.3933295965. The cubic root of 8181850 is about 201.5040770725.

The spelling of 8181850 in words is "eight million, one hundred eighty-one thousand, eight hundred fifty".