18161804 has 12 divisors (see below), whose sum is σ = 31903200. Its totient is φ = 9046608.

The previous prime is 18161791. The next prime is 18161807. The reversal of 18161804 is 40816181.

It is a super-2 number, since 2×18161804² = 659702249068832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18161807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7364 + ... + 9515.

It is an arithmetic number, because the mean of its divisors is an integer number (2658600).

Almost surely, 2^18161804 is an apocalyptic number.

It is an amenable number.

18161804 is a deficient number, since it is larger than the sum of its proper divisors (13741396).

18161804 is a wasteful number, since it uses less digits than its factorization.

18161804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17152 (or 17150 counting only the distinct ones).

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

The square root of 18161804 is about 4261.6668100639. Note that the first 3 decimals coincide. The cubic root of 18161804 is about 262.8570693244.

Adding to 18161804 its reverse (40816181), we get a palindrome (58977985).

The spelling of 18161804 in words is "eighteen million, one hundred sixty-one thousand, eight hundred four".