18818456 has 16 divisors (see below), whose sum is σ = 37360440. Its totient is φ = 8855680.

The previous prime is 18818453. The next prime is 18818461. The reversal of 18818456 is 65481881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18818453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69050 + ... + 69321.

Almost surely, 2^18818456 is an apocalyptic number.

It is an amenable number.

18818456 is a deficient number, since it is larger than the sum of its proper divisors (18541984).

18818456 is a wasteful number, since it uses less digits than its factorization.

18818456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138394 (or 138390 counting only the distinct ones).

The product of its digits is 61440, while the sum is 41.

The square root of 18818456 is about 4338.0244351548. The cubic root of 18818456 is about 265.9875623106.

The spelling of 18818456 in words is "eighteen million, eight hundred eighteen thousand, four hundred fifty-six".