18144556 has 6 divisors (see below), whose sum is σ = 31752980. Its totient is φ = 9072276.

The previous prime is 18144551. The next prime is 18144557. The reversal of 18144556 is 65544181.

It is not an unprimeable number, because it can be changed into a prime (18144551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2268066 + ... + 2268073.

Almost surely, 2^18144556 is an apocalyptic number.

It is an amenable number.

18144556 is a deficient number, since it is larger than the sum of its proper divisors (13608424).

18144556 is a wasteful number, since it uses less digits than its factorization.

18144556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536143 (or 4536141 counting only the distinct ones).

The product of its digits is 19200, while the sum is 34.

The square root of 18144556 is about 4259.6427080214. The cubic root of 18144556 is about 262.7738324627.

The spelling of 18144556 in words is "eighteen million, one hundred forty-four thousand, five hundred fifty-six".