18015145 has 8 divisors (see below), whose sum is σ = 21642120. Its totient is φ = 14396160.

The previous prime is 18015139. The next prime is 18015149. The reversal of 18015145 is 54151081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1466521 + 16548624 = 1211^2 + 4068^2 .

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

It is not a de Polignac number, because 18015145 - 2⁷ = 18015017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18015149) 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, 5601 + ... + 8209.

It is an arithmetic number, because the mean of its divisors is an integer number (2705265).

Almost surely, 2^18015145 is an apocalyptic number.

It is an amenable number.

18015145 is a deficient number, since it is larger than the sum of its proper divisors (3626975).

18015145 is a wasteful number, since it uses less digits than its factorization.

18015145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 18015145 is about 4244.4251672046. The cubic root of 18015145 is about 262.1476209056.

The spelling of 18015145 in words is "eighteen million, fifteen thousand, one hundred forty-five".