1999317 has 4 divisors (see below), whose sum is σ = 2665760. Its totient is φ = 1332876.

The previous prime is 1999307. The next prime is 1999331. The reversal of 1999317 is 7139991.

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 not a de Polignac number, because 1999317 - 2⁴ = 1999301 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999307) 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 3 ways as a sum of consecutive naturals, for example, 333217 + ... + 333222.

It is an arithmetic number, because the mean of its divisors is an integer number (666440).

2^1999317 is an apocalyptic number.

It is an amenable number.

1999317 is a deficient number, since it is larger than the sum of its proper divisors (666443).

1999317 is an equidigital number, since it uses as much as digits as its factorization.

1999317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666442.

The product of its digits is 15309, while the sum is 39.

The square root of 1999317 is about 1413.9720647877. The cubic root of 1999317 is about 125.9777612553.

The spelling of 1999317 in words is "one million, nine hundred ninety-nine thousand, three hundred seventeen".