1998135 has 48 divisors (see below), whose sum is σ = 3840480. Its totient is φ = 984960.

The previous prime is 1998133. The next prime is 1998169. The reversal of 1998135 is 5318991.

1998135 = 39³ + 40³ + ... + 56³.

It is a happy number.

It is not a de Polignac number, because 1998135 - 2¹ = 1998133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1998135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998133) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48715 + ... + 48755.

It is an arithmetic number, because the mean of its divisors is an integer number (80010).

2^1998135 is an apocalyptic number.

1998135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1998135 is a deficient number, since it is larger than the sum of its proper divisors (1842345).

1998135 is a wasteful number, since it uses less digits than its factorization.

1998135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 68 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1998135 is about 1413.5540315106. The cubic root of 1998135 is about 125.9529302642.

The spelling of 1998135 in words is "one million, nine hundred ninety-eight thousand, one hundred thirty-five".