3971988 has 36 divisors (see below), whose sum is σ = 10570560. Its totient is φ = 1254096.

The previous prime is 3971983. The next prime is 3971993. The reversal of 3971988 is 8891793.

It is an interprime number because it is at equal distance from previous prime (3971983) and next prime (3971993).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2220 + ... + 3587.

Almost surely, 2^3971988 is an apocalyptic number.

3971988 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

3971988 is an abundant number, since it is smaller than the sum of its proper divisors (6598572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3971988 is a wasteful number, since it uses less digits than its factorization.

3971988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5836 (or 5831 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 3971988 is about 1992.9846963788. The cubic root of 3971988 is about 158.3686845042.

It can be divided in two parts, 39 and 71988, that added together give a palindrome (72027).

The spelling of 3971988 in words is "three million, nine hundred seventy-one thousand, nine hundred eighty-eight".