3999959 has 4 divisors (see below), whose sum is σ = 4108104. Its totient is φ = 3891816.

The previous prime is 3999949. The next prime is 3999971. The reversal of 3999959 is 9599993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3999959 - 2⁸ = 3999703 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 3999959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54017 + ... + 54090.

It is an arithmetic number, because the mean of its divisors is an integer number (1027026).

Almost surely, 2^3999959 is an apocalyptic number.

3999959 is a deficient number, since it is larger than the sum of its proper divisors (108145).

3999959 is a wasteful number, since it uses less digits than its factorization.

3999959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108144.

The product of its digits is 885735, while the sum is 53.

The square root of 3999959 is about 1999.9897499737. The cubic root of 3999959 is about 158.7395628329.

It can be divided in two parts, 399995 and 9, that added together give a palindrome (400004).

The spelling of 3999959 in words is "three million, nine hundred ninety-nine thousand, nine hundred fifty-nine".