18161084 has 12 divisors (see below), whose sum is σ = 31812984. Its totient is φ = 9071664.

The previous prime is 18161057. The next prime is 18161089. The reversal of 18161084 is 48016181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161089) 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 3 ways as a sum of consecutive naturals, for example, 4967 + ... + 7809.

It is an arithmetic number, because the mean of its divisors is an integer number (2651082).

Almost surely, 2^18161084 is an apocalyptic number.

It is an amenable number.

18161084 is a deficient number, since it is larger than the sum of its proper divisors (13651900).

18161084 is a wasteful number, since it uses less digits than its factorization.

18161084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444 (or 4442 counting only the distinct ones).

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

The square root of 18161084 is about 4261.5823352365. The cubic root of 18161084 is about 262.8535957416.

The spelling of 18161084 in words is "eighteen million, one hundred sixty-one thousand, eighty-four".