1998597 has 8 divisors (see below), whose sum is σ = 2726944. Its totient is φ = 1301328.

The previous prime is 1998589. The next prime is 1998611. The reversal of 1998597 is 7958991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1998597 - 2³ = 1998589 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 (1998517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7618 + ... + 7875.

It is an arithmetic number, because the mean of its divisors is an integer number (340868).

2^1998597 is an apocalyptic number.

It is an amenable number.

1998597 is a deficient number, since it is larger than the sum of its proper divisors (728347).

1998597 is a wasteful number, since it uses less digits than its factorization.

1998597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15539.

The product of its digits is 204120, while the sum is 48.

The square root of 1998597 is about 1413.7174399434. The cubic root of 1998597 is about 125.9626369439.

The spelling of 1998597 in words is "one million, nine hundred ninety-eight thousand, five hundred ninety-seven".