18145388 has 12 divisors (see below), whose sum is σ = 31819032. Its totient is φ = 9054240.

The previous prime is 18145363. The next prime is 18145423. The reversal of 18145388 is 88354181.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2270 + ... + 6437.

It is an arithmetic number, because the mean of its divisors is an integer number (2651586).

Almost surely, 2^18145388 is an apocalyptic number.

It is an amenable number.

18145388 is a deficient number, since it is larger than the sum of its proper divisors (13673644).

18145388 is a wasteful number, since it uses less digits than its factorization.

18145388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9232 (or 9230 counting only the distinct ones).

The product of its digits is 30720, while the sum is 38.

The square root of 18145388 is about 4259.7403676750. The cubic root of 18145388 is about 262.7778488095. Note that the first 3 decimals are identical.

The spelling of 18145388 in words is "eighteen million, one hundred forty-five thousand, three hundred eighty-eight".