1988071 has 4 divisors (see below), whose sum is σ = 2016144. Its totient is φ = 1960000.

The previous prime is 1988057. The next prime is 1988087. The reversal of 1988071 is 1708891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1708891 = 17 ⋅100523.

It is a 6-Lehmer number, since φ(1988071) divides (1988071-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 1988071 - 2¹⁷ = 1856999 is a prime.

It is a Duffinian number.

1988071 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13930 + ... + 14071.

It is an arithmetic number, because the mean of its divisors is an integer number (504036).

2^1988071 is an apocalyptic number.

1988071 is a deficient number, since it is larger than the sum of its proper divisors (28073).

1988071 is an equidigital number, since it uses as much as digits as its factorization.

1988071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28072.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1988071 is about 1409.9897162746. The cubic root of 1988071 is about 125.7411120068.

The spelling of 1988071 in words is "one million, nine hundred eighty-eight thousand, seventy-one".