3998439 has 6 divisors (see below), whose sum is σ = 5775536. Its totient is φ = 2665620.

The previous prime is 3998419. The next prime is 3998459. The reversal of 3998439 is 9348993.

It is an interprime number because it is at equal distance from previous prime (3998419) and next prime (3998459).

It is not a de Polignac number, because 3998439 - 2⁹ = 3997927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3998394 and 3998403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998419) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 222127 + ... + 222144.

Almost surely, 2^3998439 is an apocalyptic number.

3998439 is a deficient number, since it is larger than the sum of its proper divisors (1777097).

3998439 is a wasteful number, since it uses less digits than its factorization.

3998439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444277 (or 444274 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 3998439 is about 1999.6097119188. The cubic root of 3998439 is about 158.7194530681.

The spelling of 3998439 in words is "three million, nine hundred ninety-eight thousand, four hundred thirty-nine".