1998786 has 8 divisors (see below), whose sum is σ = 3997584. Its totient is φ = 666260.

The previous prime is 1998761. The next prime is 1998793. The reversal of 1998786 is 6878991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

1998786 is an admirable number.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166560 + ... + 166571.

It is an arithmetic number, because the mean of its divisors is an integer number (499698).

2^1998786 is an apocalyptic number.

1998786 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.

1998786 is a wasteful number, since it uses less digits than its factorization.

1998786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333136.

The product of its digits is 217728, while the sum is 48.

The square root of 1998786 is about 1413.7842834039. The cubic root of 1998786 is about 125.9666074272.

The spelling of 1998786 in words is "one million, nine hundred ninety-eight thousand, seven hundred eighty-six".