18180445 has 8 divisors (see below), whose sum is σ = 21864960. Its totient is φ = 14512080.

The previous prime is 18180439. The next prime is 18180469. The reversal of 18180445 is 54408181.

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

It is not a de Polignac number, because 18180445 - 2⁵ = 18180413 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1401 + ... + 6190.

It is an arithmetic number, because the mean of its divisors is an integer number (2733120).

Almost surely, 2^18180445 is an apocalyptic number.

It is an amenable number.

18180445 is a deficient number, since it is larger than the sum of its proper divisors (3684515).

18180445 is an equidigital number, since it uses as much as digits as its factorization.

18180445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8075.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 18180445 is about 4263.8533042308. The cubic root of 18180445 is about 262.9469694097.

The spelling of 18180445 in words is "eighteen million, one hundred eighty thousand, four hundred forty-five".