1798989 has 4 divisors (see below), whose sum is σ = 2398656. Its totient is φ = 1199324.

The previous prime is 1798987. The next prime is 1798997. The reversal of 1798989 is 9898971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1798989 - 2¹ = 1798987 is a prime.

It is a super-2 number, since 2×1798989² = 6472722844242, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1798987) 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, 299829 + ... + 299834.

It is an arithmetic number, because the mean of its divisors is an integer number (599664).

2^1798989 is an apocalyptic number.

It is an amenable number.

1798989 is a deficient number, since it is larger than the sum of its proper divisors (599667).

1798989 is an equidigital number, since it uses as much as digits as its factorization.

1798989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599666.

The product of its digits is 326592, while the sum is 51.

The square root of 1798989 is about 1341.2639561250. The cubic root of 1798989 is about 121.6212611788.

The spelling of 1798989 in words is "one million, seven hundred ninety-eight thousand, nine hundred eighty-nine".