18355948 has 24 divisors (see below), whose sum is σ = 35018928. Its totient is φ = 8367936.

The previous prime is 18355943. The next prime is 18355949. The reversal of 18355948 is 84955381.

It is not an unprimeable number, because it can be changed into a prime (18355943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2190 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (1459122).

Almost surely, 2^18355948 is an apocalyptic number.

It is an amenable number.

18355948 is a deficient number, since it is larger than the sum of its proper divisors (16662980).

18355948 is a wasteful number, since it uses less digits than its factorization.

18355948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353 (or 4351 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The square root of 18355948 is about 4284.3842031265. The cubic root of 18355948 is about 263.7903715445.

The spelling of 18355948 in words is "eighteen million, three hundred fifty-five thousand, nine hundred forty-eight".