19907225 has 12 divisors (see below), whose sum is σ = 26584236. Its totient is φ = 14700480.

The previous prime is 19907207. The next prime is 19907227. The reversal of 19907225 is 52270991.

It can be written as a sum of positive squares in 6 ways, for example, as 5626384 + 14280841 = 2372^2 + 3779^2 .

It is not a de Polignac number, because 19907225 - 2⁶ = 19907161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19907227) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 30302 + ... + 30951.

It is an arithmetic number, because the mean of its divisors is an integer number (2215353).

Almost surely, 2^19907225 is an apocalyptic number.

It is an amenable number.

19907225 is a deficient number, since it is larger than the sum of its proper divisors (6677011).

19907225 is a wasteful number, since it uses less digits than its factorization.

19907225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61276 (or 61271 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 19907225 is about 4461.7513377596. The cubic root of 19907225 is about 271.0213941707.

The spelling of 19907225 in words is "nineteen million, nine hundred seven thousand, two hundred twenty-five".