10185818 has 4 divisors (see below), whose sum is σ = 15278730. Its totient is φ = 5092908.

The previous prime is 10185817. The next prime is 10185827. The reversal of 10185818 is 81858101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5678689 + 4507129 = 2383^2 + 2123^2 .

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

It is not an unprimeable number, because it can be changed into a prime (10185811) 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 as a sum of consecutive naturals, namely, 2546453 + ... + 2546456.

Almost surely, 2^10185818 is an apocalyptic number.

10185818 is a deficient number, since it is larger than the sum of its proper divisors (5092912).

10185818 is an equidigital number, since it uses as much as digits as its factorization.

10185818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5092911.

The product of its (nonzero) digits is 2560, while the sum is 32.

The square root of 10185818 is about 3191.5228340089. The cubic root of 10185818 is about 216.7697303228.

The spelling of 10185818 in words is "ten million, one hundred eighty-five thousand, eight hundred eighteen".