18180802 has 8 divisors (see below), whose sum is σ = 27785916. Its totient is φ = 8918832.

The previous prime is 18180797. The next prime is 18180809. The reversal of 18180802 is 20808181.

It can be written as a sum of positive squares in 2 ways, for example, as 14295961 + 3884841 = 3781^2 + 1971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18180802² = 661083122726408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18180809) by changing a digit.

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, 85653 + ... + 85864.

Almost surely, 2^18180802 is an apocalyptic number.

18180802 is a deficient number, since it is larger than the sum of its proper divisors (9605114).

18180802 is a wasteful number, since it uses less digits than its factorization.

18180802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171572.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 18180802 is about 4263.8951675669. The cubic root of 18180802 is about 262.9486905163.

Adding to 18180802 its reverse (20808181), we get a palindrome (38988983).

The spelling of 18180802 in words is "eighteen million, one hundred eighty thousand, eight hundred two".