1998595 has 4 divisors (see below), whose sum is σ = 2398320. Its totient is φ = 1598872.

The previous prime is 1998589. The next prime is 1998611. The reversal of 1998595 is 5958991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5958991 = 251 ⋅23741.

It is a cyclic number.

It is not a de Polignac number, because 1998595 - 2³ = 1998587 is a prime.

1998595 is a lucky number.

It is a zygodrome in base 2.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 199855 + ... + 199864.

It is an arithmetic number, because the mean of its divisors is an integer number (599580).

2^1998595 is an apocalyptic number.

1998595 is a deficient number, since it is larger than the sum of its proper divisors (399725).

1998595 is an equidigital number, since it uses as much as digits as its factorization.

1998595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399724.

The product of its digits is 145800, while the sum is 46.

The square root of 1998595 is about 1413.7167325883. The cubic root of 1998595 is about 125.9625949269.

The spelling of 1998595 in words is "one million, nine hundred ninety-eight thousand, five hundred ninety-five".