8439988 has 24 divisors (see below), whose sum is σ = 15523200. Its totient is φ = 4007520.

The previous prime is 8439961. The next prime is 8439989. The reversal of 8439988 is 8899348.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8439989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18078 + ... + 18538.

It is an arithmetic number, because the mean of its divisors is an integer number (646800).

Almost surely, 2^8439988 is an apocalyptic number.

It is an amenable number.

8439988 is a deficient number, since it is larger than the sum of its proper divisors (7083212).

8439988 is a wasteful number, since it uses less digits than its factorization.

8439988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 685 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 8439988 is about 2905.1657439809. The cubic root of 8439988 is about 203.6013295626.

The spelling of 8439988 in words is "eight million, four hundred thirty-nine thousand, nine hundred eighty-eight".