3989997 has 24 divisors (see below), whose sum is σ = 6447168. Its totient is φ = 2356800.

The previous prime is 3989989. The next prime is 3990001. The reversal of 3989997 is 7999893.

It is a happy number.

It is not a de Polignac number, because 3989997 - 2³ = 3989989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989957) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3568 + ... + 4550.

It is an arithmetic number, because the mean of its divisors is an integer number (268632).

Almost surely, 2^3989997 is an apocalyptic number.

It is an amenable number.

3989997 is a deficient number, since it is larger than the sum of its proper divisors (2457171).

3989997 is a wasteful number, since it uses less digits than its factorization.

3989997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041 (or 1038 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 3989997 is about 1997.4976846044. The cubic root of 3989997 is about 158.6076716350.

The spelling of 3989997 in words is "three million, nine hundred eighty-nine thousand, nine hundred ninety-seven".