1998617 has 2 divisors, whose sum is σ = 1998618. Its totient is φ = 1998616.

The previous prime is 1998611. The next prime is 1998637. The reversal of 1998617 is 7168991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1485961 + 512656 = 1219^2 + 716^2 .

It is an emirp because it is prime and its reverse (7168991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1998617 - 2¹² = 1994521 is a prime.

It is a super-3 number, since 3×1998617³ = 23950246420466253339, which contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1998611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999308 + 999309.

It is an arithmetic number, because the mean of its divisors is an integer number (999309).

2^1998617 is an apocalyptic number.

It is an amenable number.

1998617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998617 is an equidigital number, since it uses as much as digits as its factorization.

1998617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 41.

The square root of 1998617 is about 1413.7245134750. The cubic root of 1998617 is about 125.9630571127.

The spelling of 1998617 in words is "one million, nine hundred ninety-eight thousand, six hundred seventeen".