3916639 has 2 divisors, whose sum is σ = 3916640. Its totient is φ = 3916638.

The previous prime is 3916637. The next prime is 3916643. The reversal of 3916639 is 9366193.

It is a weak prime.

It is an emirp because it is prime and its reverse (9366193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3916639 - 2¹ = 3916637 is a prime.

It is a super-2 number, since 2×3916639² = 30680122112642, which contains 22 as substring.

Together with 3916637, it forms a pair of twin primes.

3916639 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3916598 and 3916607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3916631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1958319 + 1958320.

It is an arithmetic number, because the mean of its divisors is an integer number (1958320).

Almost surely, 2^3916639 is an apocalyptic number.

3916639 is a deficient number, since it is larger than the sum of its proper divisors (1).

3916639 is an equidigital number, since it uses as much as digits as its factorization.

3916639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 37.

The square root of 3916639 is about 1979.0500246330. The cubic root of 3916639 is about 157.6296270540.

The spelling of 3916639 in words is "three million, nine hundred sixteen thousand, six hundred thirty-nine".