3934639 has 2 divisors, whose sum is σ = 3934640. Its totient is φ = 3934638.

The previous prime is 3934631. The next prime is 3934669. The reversal of 3934639 is 9364393.

It is a weak prime.

It is an emirp because it is prime and its reverse (9364393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3934639 - 2³ = 3934631 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3934598 and 3934607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3934631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1967319 + 1967320.

It is an arithmetic number, because the mean of its divisors is an integer number (1967320).

Almost surely, 2^3934639 is an apocalyptic number.

3934639 is a deficient number, since it is larger than the sum of its proper divisors (1).

3934639 is an equidigital number, since it uses as much as digits as its factorization.

3934639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 37.

The square root of 3934639 is about 1983.5924480598. The cubic root of 3934639 is about 157.8707349501.

The spelling of 3934639 in words is "three million, nine hundred thirty-four thousand, six hundred thirty-nine".