19984025 has 6 divisors (see below), whose sum is σ = 24780222. Its totient is φ = 15987200.

The previous prime is 19984001. The next prime is 19984031. The reversal of 19984025 is 52048991.

It can be written as a sum of positive squares in 3 ways, for example, as 1827904 + 18156121 = 1352^2 + 4261^2 .

It is not a de Polignac number, because 19984025 - 2¹² = 19979929 is a prime.

It is a super-2 number, since 2×19984025² = 798722510401250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19984025.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399656 + ... + 399705.

It is an arithmetic number, because the mean of its divisors is an integer number (4130037).

Almost surely, 2^19984025 is an apocalyptic number.

It is an amenable number.

19984025 is a deficient number, since it is larger than the sum of its proper divisors (4796197).

19984025 is an equidigital number, since it uses as much as digits as its factorization.

19984025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799371 (or 799366 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 19984025 is about 4470.3495389063. The cubic root of 19984025 is about 271.3694710397.

The spelling of 19984025 in words is "nineteen million, nine hundred eighty-four thousand, twenty-five".