19909125 has 64 divisors (see below), whose sum is σ = 39087360. Its totient is φ = 9964800.

The previous prime is 19909121. The next prime is 19909139. The reversal of 19909125 is 52190991.

It is not a de Polignac number, because 19909125 - 2² = 19909121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19909125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19909121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57202 + ... + 57548.

It is an arithmetic number, because the mean of its divisors is an integer number (610740).

Almost surely, 2^19909125 is an apocalyptic number.

19909125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19909125 is a deficient number, since it is larger than the sum of its proper divisors (19178235).

19909125 is a wasteful number, since it uses less digits than its factorization.

19909125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 19909125 is about 4461.9642535547. The cubic root of 19909125 is about 271.0300162374.

The spelling of 19909125 in words is "nineteen million, nine hundred nine thousand, one hundred twenty-five".