19479109 has 12 divisors (see below), whose sum is σ = 21374400. Its totient is φ = 17740944.

The previous prime is 19479107. The next prime is 19479113. The reversal of 19479109 is 90197491.

It is a happy number.

It is not a de Polignac number, because 19479109 - 2¹ = 19479107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19479107) 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, 12622 + ... + 14080.

It is an arithmetic number, because the mean of its divisors is an integer number (1781200).

Almost surely, 2^19479109 is an apocalyptic number.

It is an amenable number.

19479109 is a deficient number, since it is larger than the sum of its proper divisors (1895291).

19479109 is a wasteful number, since it uses less digits than its factorization.

19479109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564 (or 1551 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 19479109 is about 4413.5143593286. The cubic root of 19479109 is about 269.0644760064.

The spelling of 19479109 in words is "nineteen million, four hundred seventy-nine thousand, one hundred nine".