1909340417 has 4 divisors (see below), whose sum is σ = 1909767636. Its totient is φ = 1908913200.

The previous prime is 1909340413. The next prime is 1909340441. The reversal of 1909340417 is 7140439091.

It is a Cunningham number, because it is equal to 43696²+1.

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 7595536 + 1901744881 = 2756^2 + 43609^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909340417 - 2² = 1909340413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1909340413) 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, 206834 + ... + 215867.

It is an arithmetic number, because the mean of its divisors is an integer number (477441909).

Almost surely, 2^1909340417 is an apocalyptic number.

It is an amenable number.

1909340417 is a deficient number, since it is larger than the sum of its proper divisors (427219).

1909340417 is an equidigital number, since it uses as much as digits as its factorization.

1909340417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427218.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1909340417 is about 43696.0000114427. Note that the first 4 decimals coincide. The cubic root of 1909340417 is about 1240.5886073470.

The spelling of 1909340417 in words is "one billion, nine hundred nine million, three hundred forty thousand, four hundred seventeen".