18821448 has 48 divisors (see below), whose sum is σ = 53976780. Its totient is φ = 5904384.

The previous prime is 18821443. The next prime is 18821449. The reversal of 18821448 is 84412881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13972644 + 4848804 = 3738^2 + 2202^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18821443) 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 11 ways as a sum of consecutive naturals, for example, 6465 + ... + 8912.

Almost surely, 2^18821448 is an apocalyptic number.

18821448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18821448 is an abundant number, since it is smaller than the sum of its proper divisors (35155332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18821448 is a wasteful number, since it uses less digits than its factorization.

18821448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15406 (or 15399 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 18821448 is about 4338.3692788881. The cubic root of 18821448 is about 266.0016582707.

The spelling of 18821448 in words is "eighteen million, eight hundred twenty-one thousand, four hundred forty-eight".