1998347 has 4 divisors (see below), whose sum is σ = 2152080. Its totient is φ = 1844616.

The previous prime is 1998343. The next prime is 1998349. The reversal of 1998347 is 7438991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998347 - 2² = 1998343 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76847 + ... + 76872.

It is an arithmetic number, because the mean of its divisors is an integer number (538020).

2^1998347 is an apocalyptic number.

1998347 is a deficient number, since it is larger than the sum of its proper divisors (153733).

1998347 is a wasteful number, since it uses less digits than its factorization.

1998347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153732.

The product of its digits is 54432, while the sum is 41.

The square root of 1998347 is about 1413.6290178120. The cubic root of 1998347 is about 125.9573845973.

The spelling of 1998347 in words is "one million, nine hundred ninety-eight thousand, three hundred forty-seven".