18221048 has 16 divisors (see below), whose sum is σ = 35343000. Its totient is φ = 8796256.

The previous prime is 18221041. The next prime is 18221081. The reversal of 18221048 is 84012281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221041) 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, 39038 + ... + 39501.

Almost surely, 2^18221048 is an apocalyptic number.

It is an amenable number.

18221048 is a deficient number, since it is larger than the sum of its proper divisors (17121952).

18221048 is a wasteful number, since it uses less digits than its factorization.

18221048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78574 (or 78570 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 18221048 is about 4268.6119523798. The cubic root of 18221048 is about 263.1425733059.

The spelling of 18221048 in words is "eighteen million, two hundred twenty-one thousand, forty-eight".