18218548 has 6 divisors (see below), whose sum is σ = 31882466. Its totient is φ = 9109272.

The previous prime is 18218527. The next prime is 18218561. The reversal of 18218548 is 84581281.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16990884 + 1227664 = 4122^2 + 1108^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277315 + ... + 2277322.

Almost surely, 2^18218548 is an apocalyptic number.

It is an amenable number.

18218548 is a deficient number, since it is larger than the sum of its proper divisors (13663918).

18218548 is a wasteful number, since it uses less digits than its factorization.

18218548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554641 (or 4554639 counting only the distinct ones).

The product of its digits is 20480, while the sum is 37.

The square root of 18218548 is about 4268.3191070959. The cubic root of 18218548 is about 263.1305380208.

The spelling of 18218548 in words is "eighteen million, two hundred eighteen thousand, five hundred forty-eight".