1671998 has 8 divisors (see below), whose sum is σ = 2521200. Its totient is φ = 831600.

The previous prime is 1671997. The next prime is 1672003. The reversal of 1671998 is 8991761.

It is a happy number.

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 (1671997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703 + ... + 2498.

It is an arithmetic number, because the mean of its divisors is an integer number (315150).

2^1671998 is an apocalyptic number.

1671998 is a deficient number, since it is larger than the sum of its proper divisors (849202).

1671998 is a wasteful number, since it uses less digits than its factorization.

1671998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4402.

The product of its digits is 27216, while the sum is 41.

The square root of 1671998 is about 1293.0576166591. The cubic root of 1671998 is about 118.6893954836.

The spelling of 1671998 in words is "one million, six hundred seventy-one thousand, nine hundred ninety-eight".