1988218 has 8 divisors (see below), whose sum is σ = 3157812. Its totient is φ = 935616.

The previous prime is 1988197. The next prime is 1988219. The reversal of 1988218 is 8128891.

It can be written as a sum of positive squares in 2 ways, for example, as 1830609 + 157609 = 1353^2 + 397^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1988219) 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, 29205 + ... + 29272.

2^1988218 is an apocalyptic number.

1988218 is a deficient number, since it is larger than the sum of its proper divisors (1169594).

1988218 is a wasteful number, since it uses less digits than its factorization.

1988218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58496.

The product of its digits is 9216, while the sum is 37.

The square root of 1988218 is about 1410.0418433508. The cubic root of 1988218 is about 125.7442110725.

It can be divided in two parts, 19882 and 18, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 1988218 in words is "one million, nine hundred eighty-eight thousand, two hundred eighteen".