1988187 has 8 divisors (see below), whose sum is σ = 2671680. Its totient is φ = 1315080.

The previous prime is 1988183. The next prime is 1988197. The reversal of 1988187 is 7818891.

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

It is not a de Polignac number, because 1988187 - 2² = 1988183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988183) 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 7 ways as a sum of consecutive naturals, for example, 2137 + ... + 2922.

It is an arithmetic number, because the mean of its divisors is an integer number (333960).

2^1988187 is an apocalyptic number.

1988187 is a deficient number, since it is larger than the sum of its proper divisors (683493).

1988187 is a wasteful number, since it uses less digits than its factorization.

1988187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5193.

The product of its digits is 32256, while the sum is 42.

The square root of 1988187 is about 1410.0308507263. The cubic root of 1988187 is about 125.7435575407.

It can be divided in two parts, 198 and 8187, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 1988187 in words is "one million, nine hundred eighty-eight thousand, one hundred eighty-seven".