1998698 has 8 divisors (see below), whose sum is σ = 3228708. Its totient is φ = 922464.

The previous prime is 1998697. The next prime is 1998701. The reversal of 1998698 is 8968991.

It can be written as a sum of positive squares in 2 ways, for example, as 1951609 + 47089 = 1397^2 + 217^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998691) 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, 38411 + ... + 38462.

2^1998698 is an apocalyptic number.

1998698 is a deficient number, since it is larger than the sum of its proper divisors (1230010).

1998698 is a wasteful number, since it uses less digits than its factorization.

1998698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76888.

The product of its digits is 279936, while the sum is 50.

The square root of 1998698 is about 1413.7531609160. The cubic root of 1998698 is about 125.9647587677.

The spelling of 1998698 in words is "one million, nine hundred ninety-eight thousand, six hundred ninety-eight".