18145508 has 6 divisors (see below), whose sum is σ = 31754646. Its totient is φ = 9072752.

The previous prime is 18145489. The next prime is 18145529. The reversal of 18145508 is 80554181.

It can be written as a sum of positive squares in only one way, i.e., 17707264 + 438244 = 4208^2 + 662^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2268185 + ... + 2268192.

It is an arithmetic number, because the mean of its divisors is an integer number (5292441).

Almost surely, 2^18145508 is an apocalyptic number.

It is an amenable number.

18145508 is a deficient number, since it is larger than the sum of its proper divisors (13609138).

18145508 is a wasteful number, since it uses less digits than its factorization.

18145508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536381 (or 4536379 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 18145508 is about 4259.7544530172. The cubic root of 18145508 is about 262.7784280801.

Adding to 18145508 its reverse (80554181), we get a palindrome (98699689).

The spelling of 18145508 in words is "eighteen million, one hundred forty-five thousand, five hundred eight".