18012145 has 8 divisors (see below), whose sum is σ = 21649320. Its totient is φ = 14386560.

The previous prime is 18012143. The next prime is 18012149. The reversal of 18012145 is 54121081.

It can be written as a sum of positive squares in 4 ways, for example, as 136161 + 17875984 = 369^2 + 4228^2 .

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

It is not a de Polignac number, because 18012145 - 2¹ = 18012143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18012143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005 + ... + 6085.

It is an arithmetic number, because the mean of its divisors is an integer number (2706165).

Almost surely, 2^18012145 is an apocalyptic number.

It is an amenable number.

18012145 is a deficient number, since it is larger than the sum of its proper divisors (3637175).

18012145 is an equidigital number, since it uses as much as digits as its factorization.

18012145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5795.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 18012145 is about 4244.0717477441. The cubic root of 18012145 is about 262.1330685845.

The spelling of 18012145 in words is "eighteen million, twelve thousand, one hundred forty-five".