1998535 has 32 divisors (see below), whose sum is σ = 3110400. Its totient is φ = 1196160.

The previous prime is 1998533. The next prime is 1998541. The reversal of 1998535 is 5358991.

1998535 = T₂₆ + T₂₇ + ... + T₂₂₈.

It is not a de Polignac number, because 1998535 - 2¹ = 1998533 is a prime.

It is an Ulam number.

1998535 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11076 + ... + 11254.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2^1998535 is an apocalyptic number.

1998535 is a deficient number, since it is larger than the sum of its proper divisors (1111865).

1998535 is a wasteful number, since it uses less digits than its factorization.

1998535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231.

The product of its digits is 48600, while the sum is 40.

The square root of 1998535 is about 1413.6955117705. The cubic root of 1998535 is about 125.9613344028.

The spelling of 1998535 in words is "one million, nine hundred ninety-eight thousand, five hundred thirty-five".