1971988 has 12 divisors (see below), whose sum is σ = 3461920. Its totient is φ = 982872.

The previous prime is 1971967. The next prime is 1972007. The reversal of 1971988 is 8891791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1195 + ... + 2317.

2^1971988 is an apocalyptic number.

It is an amenable number.

1971988 is a deficient number, since it is larger than the sum of its proper divisors (1489932).

1971988 is a wasteful number, since it uses less digits than its factorization.

1971988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566 (or 1564 counting only the distinct ones).

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

The square root of 1971988 is about 1404.2749018622. The cubic root of 1971988 is about 125.4011220983.

The spelling of 1971988 in words is "one million, nine hundred seventy-one thousand, nine hundred eighty-eight".