19964225 has 6 divisors (see below), whose sum is σ = 24755670. Its totient is φ = 15971360.

The previous prime is 19964179. The next prime is 19964227. The reversal of 19964225 is 52246991.

It can be written as a sum of positive squares in 3 ways, for example, as 744769 + 19219456 = 863^2 + 4384^2 .

It is not a de Polignac number, because 19964225 - 2¹⁰ = 19963201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19964227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399260 + ... + 399309.

It is an arithmetic number, because the mean of its divisors is an integer number (4125945).

Almost surely, 2^19964225 is an apocalyptic number.

It is an amenable number.

19964225 is a deficient number, since it is larger than the sum of its proper divisors (4791445).

19964225 is an equidigital number, since it uses as much as digits as its factorization.

19964225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798579 (or 798574 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 19964225 is about 4468.1343981577. The cubic root of 19964225 is about 271.2798179117.

The spelling of 19964225 in words is "nineteen million, nine hundred sixty-four thousand, two hundred twenty-five".