1988671 has 2 divisors, whose sum is σ = 1988672. Its totient is φ = 1988670.

The previous prime is 1988669. The next prime is 1988683. The reversal of 1988671 is 1768891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1988671 - 2¹ = 1988669 is a prime.

Together with 1988669, it forms a pair of twin primes.

1988671 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988611) 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 as a sum of consecutive naturals, namely, 994335 + 994336.

It is an arithmetic number, because the mean of its divisors is an integer number (994336).

2^1988671 is an apocalyptic number.

1988671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988671 is an equidigital number, since it uses as much as digits as its factorization.

1988671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 40.

The square root of 1988671 is about 1410.2024677329. The cubic root of 1988671 is about 125.7537602940.

The spelling of 1988671 in words is "one million, nine hundred eighty-eight thousand, six hundred seventy-one".