1988971 has 4 divisors (see below), whose sum is σ = 2075472. Its totient is φ = 1902472.

The previous prime is 1988963. The next prime is 1988999. The reversal of 1988971 is 1798891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1988971 - 2³ = 1988963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988941) 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, 43216 + ... + 43261.

It is an arithmetic number, because the mean of its divisors is an integer number (518868).

2^1988971 is an apocalyptic number.

1988971 is a deficient number, since it is larger than the sum of its proper divisors (86501).

1988971 is an equidigital number, since it uses as much as digits as its factorization.

1988971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86500.

The product of its digits is 36288, while the sum is 43.

The square root of 1988971 is about 1410.3088314266. The cubic root of 1988971 is about 125.7600834835.

The spelling of 1988971 in words is "one million, nine hundred eighty-eight thousand, nine hundred seventy-one".