1998599 has 4 divisors (see below), whose sum is σ = 2014464. Its totient is φ = 1982736.

The previous prime is 1998589. The next prime is 1998611. The reversal of 1998599 is 9958991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998599 - 2⁸ = 1998343 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998559) 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, 7742 + ... + 7995.

It is an arithmetic number, because the mean of its divisors is an integer number (503616).

2^1998599 is an apocalyptic number.

1998599 is a deficient number, since it is larger than the sum of its proper divisors (15865).

1998599 is a wasteful number, since it uses less digits than its factorization.

1998599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15864.

The product of its digits is 262440, while the sum is 50.

The square root of 1998599 is about 1413.7181472981. The cubic root of 1998599 is about 125.9626789609.

The spelling of 1998599 in words is "one million, nine hundred ninety-eight thousand, five hundred ninety-nine".