19825218 has 48 divisors (see below), whose sum is σ = 51232896. Its totient is φ = 5417280.

The previous prime is 19825207. The next prime is 19825219. The reversal of 19825218 is 81252891.

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 Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19825219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 523 + ... + 6318.

It is an arithmetic number, because the mean of its divisors is an integer number (1067352).

Almost surely, 2^19825218 is an apocalyptic number.

19825218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19825218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25616448).

19825218 is an abundant number, since it is smaller than the sum of its proper divisors (31407678).

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

19825218 is a wasteful number, since it uses less digits than its factorization.

19825218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879 (or 6876 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 19825218 is about 4452.5518525897. The cubic root of 19825218 is about 270.6487281205.

The spelling of 19825218 in words is "nineteen million, eight hundred twenty-five thousand, two hundred eighteen".