18120045 has 16 divisors (see below), whose sum is σ = 30697920. Its totient is φ = 9095424.

The previous prime is 18120023. The next prime is 18120049. The reversal of 18120045 is 54002181.

It is not a de Polignac number, because 18120045 - 2⁵ = 18120013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35275 + ... + 35784.

It is an arithmetic number, because the mean of its divisors is an integer number (1918620).

Almost surely, 2^18120045 is an apocalyptic number.

18120045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18120045 is a deficient number, since it is larger than the sum of its proper divisors (12577875).

18120045 is a wasteful number, since it uses less digits than its factorization.

18120045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71084.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18120045 is about 4256.7646164664. The cubic root of 18120045 is about 262.6554544059.

The spelling of 18120045 in words is "eighteen million, one hundred twenty thousand, forty-five".