19697725 has 12 divisors (see below), whose sum is σ = 24483924. Its totient is φ = 15720320.

The previous prime is 19697719. The next prime is 19697759. The reversal of 19697725 is 52779691.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2566404 + 17131321 = 1602^2 + 4139^2 .

It is not a de Polignac number, because 19697725 - 2⁷ = 19697597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14787 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (2040327).

Almost surely, 2^19697725 is an apocalyptic number.

It is an amenable number.

19697725 is a deficient number, since it is larger than the sum of its proper divisors (4786199).

19697725 is a wasteful number, since it uses less digits than its factorization.

19697725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 1899 counting only the distinct ones).

The product of its digits is 238140, while the sum is 46.

The square root of 19697725 is about 4438.2119147242. The cubic root of 19697725 is about 270.0673128924.

The spelling of 19697725 in words is "nineteen million, six hundred ninety-seven thousand, seven hundred twenty-five".