3999539 has 16 divisors (see below), whose sum is σ = 4525632. Its totient is φ = 3514368.

The previous prime is 3999529. The next prime is 3999547. The reversal of 3999539 is 9359993.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3999539 - 2⁸ = 3999283 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3999493 and 3999502.

It is not an unprimeable number, because it can be changed into a prime (3999529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20627 + ... + 20819.

It is an arithmetic number, because the mean of its divisors is an integer number (282852).

Almost surely, 2^3999539 is an apocalyptic number.

3999539 is a deficient number, since it is larger than the sum of its proper divisors (526093).

3999539 is a wasteful number, since it uses less digits than its factorization.

3999539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286.

The product of its digits is 295245, while the sum is 47.

The square root of 3999539 is about 1999.8847466792. The cubic root of 3999539 is about 158.7340066968.

The spelling of 3999539 in words is "three million, nine hundred ninety-nine thousand, five hundred thirty-nine".