19944225 has 108 divisors (see below), whose sum is σ = 43736784. Its totient is φ = 8981280.

The previous prime is 19944203. The next prime is 19944227. The reversal of 19944225 is 52244991.

19944225 is a `hidden beast` number, since 199 + 442 + 25 = 666.

It is not a de Polignac number, because 19944225 - 2⁵ = 19944193 is a prime.

It is a super-2 number, since 2×19944225² = 795544221701250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19944225.

It is not an unprimeable number, because it can be changed into a prime (19944227) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 297642 + ... + 297708.

Almost surely, 2^19944225 is an apocalyptic number.

19944225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19944225 is an abundant number, since it is smaller than the sum of its proper divisors (23792559).

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

19944225 is an equidigital number, since it uses as much as digits as its factorization.

19944225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 82 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 19944225 is about 4465.8957668087. The cubic root of 19944225 is about 271.1891989981.

The spelling of 19944225 in words is "nineteen million, nine hundred forty-four thousand, two hundred twenty-five".