3939639 has 12 divisors (see below), whose sum is σ = 5774328. Its totient is φ = 2387440.

The previous prime is 3939619. The next prime is 3939641. The reversal of 3939639 is 9369393.

It is not a de Polignac number, because 3939639 - 2¹⁶ = 3874103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3939639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5064 + ... + 5789.

It is an arithmetic number, because the mean of its divisors is an integer number (481194).

Almost surely, 2^3939639 is an apocalyptic number.

3939639 is a deficient number, since it is larger than the sum of its proper divisors (1834689).

3939639 is a wasteful number, since it uses less digits than its factorization.

3939639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10878 (or 10867 counting only the distinct ones).

The product of its digits is 118098, while the sum is 42.

The square root of 3939639 is about 1984.8523874586. The cubic root of 3939639 is about 157.9375788248.

The spelling of 3939639 in words is "three million, nine hundred thirty-nine thousand, six hundred thirty-nine".