1998633 has 16 divisors (see below), whose sum is σ = 3280256. Its totient is φ = 1054080.

The previous prime is 1998617. The next prime is 1998637. The reversal of 1998633 is 3368991.

It is not a de Polignac number, because 1998633 - 2⁴ = 1998617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1998591 and 1998600.

It is not an unprimeable number, because it can be changed into a prime (1998637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3388 + ... + 3933.

It is an arithmetic number, because the mean of its divisors is an integer number (205016).

2^1998633 is an apocalyptic number.

1998633 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1998633 is a deficient number, since it is larger than the sum of its proper divisors (1281623).

1998633 is a wasteful number, since it uses less digits than its factorization.

1998633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7344.

The product of its digits is 34992, while the sum is 39.

The square root of 1998633 is about 1413.7301722748. The cubic root of 1998633 is about 125.9633932457.

The spelling of 1998633 in words is "one million, nine hundred ninety-eight thousand, six hundred thirty-three".