19740469909 has 4 divisors (see below), whose sum is σ = 19745076780. Its totient is φ = 19735863040.

The previous prime is 19740469871. The next prime is 19740469913. The reversal of 19740469909 is 90996404791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10779007684 + 8961462225 = 103822^2 + 94665^2 .

It is a cyclic number.

It is not a de Polignac number, because 19740469909 - 2¹¹ = 19740467861 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 (19740469009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2297002 + ... + 2305579.

It is an arithmetic number, because the mean of its divisors is an integer number (4936269195).

Almost surely, 2^19740469909 is an apocalyptic number.

It is an amenable number.

19740469909 is a deficient number, since it is larger than the sum of its proper divisors (4606871).

19740469909 is an equidigital number, since it uses as much as digits as its factorization.

19740469909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4606870.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The spelling of 19740469909 in words is "nineteen billion, seven hundred forty million, four hundred sixty-nine thousand, nine hundred nine".