19689025 has 12 divisors (see below), whose sum is σ = 24691500. Its totient is φ = 15572480.

The previous prime is 19689017. The next prime is 19689029. The reversal of 19689025 is 52098691.

It can be written as a sum of positive squares in 6 ways, for example, as 7745089 + 11943936 = 2783^2 + 3456^2 .

It is not a de Polignac number, because 19689025 - 2³ = 19689017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19689029) by changing a digit.

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, 2200 + ... + 6649.

It is an arithmetic number, because the mean of its divisors is an integer number (2057625).

Almost surely, 2^19689025 is an apocalyptic number.

It is an amenable number.

19689025 is a deficient number, since it is larger than the sum of its proper divisors (5002475).

19689025 is an equidigital number, since it uses as much as digits as its factorization.

19689025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8948 (or 8943 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 19689025 is about 4437.2316820288. The cubic root of 19689025 is about 270.0275463436.

The spelling of 19689025 in words is "nineteen million, six hundred eighty-nine thousand, twenty-five".