3956817605 has 16 divisors (see below), whose sum is σ = 5158686960. Its totient is φ = 2896094208.

The previous prime is 3956817589. The next prime is 3956817617. The reversal of 3956817605 is 5067186593.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 971506561 + 2985311044 = 31169^2 + 54638^2 .

It is a cyclic number.

It is not a de Polignac number, because 3956817605 - 2⁴ = 3956817589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262010 + ... + 276699.

It is an arithmetic number, because the mean of its divisors is an integer number (322417935).

Almost surely, 2^3956817605 is an apocalyptic number.

It is an amenable number.

3956817605 is a deficient number, since it is larger than the sum of its proper divisors (1201869355).

3956817605 is a wasteful number, since it uses less digits than its factorization.

3956817605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538840.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The square root of 3956817605 is about 62903.2400198909. The cubic root of 3956817605 is about 1581.6680568976.

The spelling of 3956817605 in words is "three billion, nine hundred fifty-six million, eight hundred seventeen thousand, six hundred five".