19875009 has 32 divisors (see below), whose sum is σ = 33417216. Its totient is φ = 10206720.

The previous prime is 19874993. The next prime is 19875017. The reversal of 19875009 is 90057891.

It is a happy number.

It is not a de Polignac number, because 19875009 - 2⁴ = 19874993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19875109) 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 31 ways as a sum of consecutive naturals, for example, 21964 + ... + 22850.

It is an arithmetic number, because the mean of its divisors is an integer number (1044288).

Almost surely, 2^19875009 is an apocalyptic number.

It is an amenable number.

19875009 is a deficient number, since it is larger than the sum of its proper divisors (13542207).

19875009 is a wasteful number, since it uses less digits than its factorization.

19875009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 19875009 is about 4458.1396344215. The cubic root of 19875009 is about 270.8751166357.

It can be divided in two parts, 1987 and 5009, that added together give a palindrome (6996).

The spelling of 19875009 in words is "nineteen million, eight hundred seventy-five thousand, nine".