3997439 has 4 divisors (see below), whose sum is σ = 4018560. Its totient is φ = 3976320.

The previous prime is 3997403. The next prime is 3997453. The reversal of 3997439 is 9347993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9347993 = 251 ⋅37243.

It is a cyclic number.

It is not a de Polignac number, because 3997439 - 2¹² = 3993343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3997439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10274 + ... + 10655.

It is an arithmetic number, because the mean of its divisors is an integer number (1004640).

Almost surely, 2^3997439 is an apocalyptic number.

3997439 is a deficient number, since it is larger than the sum of its proper divisors (21121).

3997439 is a wasteful number, since it uses less digits than its factorization.

3997439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21120.

The product of its digits is 183708, while the sum is 44.

The square root of 3997439 is about 1999.3596474872. The cubic root of 3997439 is about 158.7062201800.

The spelling of 3997439 in words is "three million, nine hundred ninety-seven thousand, four hundred thirty-nine".