1988171 has 6 divisors (see below), whose sum is σ = 2018772. Its totient is φ = 1958000.

The previous prime is 1988137. The next prime is 1988177. The reversal of 1988171 is 1718891.

It is a de Polignac number, because none of the positive numbers 2^k-1988171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7796 + ... + 8046.

It is an arithmetic number, because the mean of its divisors is an integer number (336462).

2^1988171 is an apocalyptic number.

1988171 is a deficient number, since it is larger than the sum of its proper divisors (30601).

1988171 is an frugal number, since it uses more digits than its factorization.

1988171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 340 counting only the distinct ones).

The product of its digits is 4032, while the sum is 35.

The square root of 1988171 is about 1410.0251770802. The cubic root of 1988171 is about 125.7432202314.

The spelling of 1988171 in words is "one million, nine hundred eighty-eight thousand, one hundred seventy-one".