3964621439 has 2 divisors, whose sum is σ = 3964621440. Its totient is φ = 3964621438.

The previous prime is 3964621433. The next prime is 3964621489. The reversal of 3964621439 is 9341264693.

It is a weak prime.

It is an emirp because it is prime and its reverse (9341264693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3964621439 - 2⁸ = 3964621183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3964621393 and 3964621402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3964621433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1982310719 + 1982310720.

It is an arithmetic number, because the mean of its divisors is an integer number (1982310720).

Almost surely, 2^3964621439 is an apocalyptic number.

3964621439 is a deficient number, since it is larger than the sum of its proper divisors (1).

3964621439 is an equidigital number, since it uses as much as digits as its factorization.

3964621439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 47.

The square root of 3964621439 is about 62965.2399264864. The cubic root of 3964621439 is about 1582.7071890593.

The spelling of 3964621439 in words is "three billion, nine hundred sixty-four million, six hundred twenty-one thousand, four hundred thirty-nine".