19989925 has 12 divisors (see below), whose sum is σ = 24881220. Its totient is φ = 15931520.

The previous prime is 19989917. The next prime is 19989971. The reversal of 19989925 is 52998991.

It can be written as a sum of positive squares in 6 ways, for example, as 3481956 + 16507969 = 1866^2 + 4063^2 .

It is not a de Polignac number, because 19989925 - 2³ = 19989917 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5961 + ... + 8689.

It is an arithmetic number, because the mean of its divisors is an integer number (2073435).

Almost surely, 2^19989925 is an apocalyptic number.

It is an amenable number.

19989925 is a deficient number, since it is larger than the sum of its proper divisors (4891295).

19989925 is a wasteful number, since it uses less digits than its factorization.

19989925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032 (or 3027 counting only the distinct ones).

The product of its digits is 524880, while the sum is 52.

The square root of 19989925 is about 4471.0093938617. The cubic root of 19989925 is about 271.3961744080.

The spelling of 19989925 in words is "nineteen million, nine hundred eighty-nine thousand, nine hundred twenty-five".