1998836 has 12 divisors (see below), whose sum is σ = 3997728. Its totient is φ = 856632.

The previous prime is 1998827. The next prime is 1998839. The reversal of 1998836 is 6388991.

1998836 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998839) 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, 35666 + ... + 35721.

It is an arithmetic number, because the mean of its divisors is an integer number (333144).

2^1998836 is an apocalyptic number.

It is an amenable number.

1998836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1998836 is a wasteful number, since it uses less digits than its factorization.

1998836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71398 (or 71396 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The square root of 1998836 is about 1413.8019663305. The cubic root of 1998836 is about 125.9676577777.

The spelling of 1998836 in words is "one million, nine hundred ninety-eight thousand, eight hundred thirty-six".