1998806 has 8 divisors (see below), whose sum is σ = 3034584. Its totient is φ = 987280.

The previous prime is 1998793. The next prime is 1998817. The reversal of 1998806 is 6088991.

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

It is a congruent number.

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, 5855 + ... + 6186.

It is an arithmetic number, because the mean of its divisors is an integer number (379323).

2^1998806 is an apocalyptic number.

1998806 is a deficient number, since it is larger than the sum of its proper divisors (1035778).

1998806 is a wasteful number, since it uses less digits than its factorization.

1998806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12126.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1998806 is about 1413.7913566011. The cubic root of 1998806 is about 125.9670275695.

The spelling of 1998806 in words is "one million, nine hundred ninety-eight thousand, eight hundred six".