3959478409 has 2 divisors, whose sum is σ = 3959478410. Its totient is φ = 3959478408.

The previous prime is 3959478337. The next prime is 3959478443. The reversal of 3959478409 is 9048749593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3868466809 + 91011600 = 62197^2 + 9540^2 .

It is a cyclic number.

It is not a de Polignac number, because 3959478409 - 2⁹ = 3959477897 is a prime.

It is not a weakly prime, because it can be changed into another prime (3959478209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1979739204 + 1979739205.

It is an arithmetic number, because the mean of its divisors is an integer number (1979739205).

Almost surely, 2^3959478409 is an apocalyptic number.

It is an amenable number.

3959478409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3959478409 is an equidigital number, since it uses as much as digits as its factorization.

3959478409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The square root of 3959478409 is about 62924.3864411883. The cubic root of 3959478409 is about 1582.0225139480.

The spelling of 3959478409 in words is "three billion, nine hundred fifty-nine million, four hundred seventy-eight thousand, four hundred nine".