1999340609 has 4 divisors (see below), whose sum is σ = 2284960704. Its totient is φ = 1713720516.

The previous prime is 1999340597. The next prime is 1999340627. The reversal of 1999340609 is 9060439991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1999340609 - 2²⁸ = 1730905153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999340639) 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, 142810037 + ... + 142810050.

It is an arithmetic number, because the mean of its divisors is an integer number (571240176).

Almost surely, 2^1999340609 is an apocalyptic number.

It is an amenable number.

1999340609 is a deficient number, since it is larger than the sum of its proper divisors (285620095).

1999340609 is an equidigital number, since it uses as much as digits as its factorization.

1999340609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285620094.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 1999340609 is about 44713.9867267503. The cubic root of 1999340609 is about 1259.7825712417.

The spelling of 1999340609 in words is "one billion, nine hundred ninety-nine million, three hundred forty thousand, six hundred nine".