1988317 has 4 divisors (see below), whose sum is σ = 1994656. Its totient is φ = 1981980.

The previous prime is 1988299. The next prime is 1988323. The reversal of 1988317 is 7138891.

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 a de Polignac number, because none of the positive numbers 2^k-1988317 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 (1988347) 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, 2673 + ... + 3334.

It is an arithmetic number, because the mean of its divisors is an integer number (498664).

2^1988317 is an apocalyptic number.

It is an amenable number.

1988317 is a deficient number, since it is larger than the sum of its proper divisors (6339).

1988317 is an equidigital number, since it uses as much as digits as its factorization.

1988317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6338.

The product of its digits is 12096, while the sum is 37.

The square root of 1988317 is about 1410.0769482550. The cubic root of 1988317 is about 125.7462981123.

It can be divided in two parts, 19883 and 17, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 1988317 in words is "one million, nine hundred eighty-eight thousand, three hundred seventeen".