3947856001 has 2 divisors, whose sum is σ = 3947856002. Its totient is φ = 3947856000.

The previous prime is 3947855981. The next prime is 3947856047. The reversal of 3947856001 is 1006587493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2921294401 + 1026561600 = 54049^2 + 32040^2 .

It is a cyclic number.

It is not a de Polignac number, because 3947856001 - 2⁵ = 3947855969 is a prime.

It is not a weakly prime, because it can be changed into another prime (3947856301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973928000 + 1973928001.

It is an arithmetic number, because the mean of its divisors is an integer number (1973928001).

Almost surely, 2^3947856001 is an apocalyptic number.

It is an amenable number.

3947856001 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947856001 is an equidigital number, since it uses as much as digits as its factorization.

3947856001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 3947856001 is about 62831.9663945034. The cubic root of 3947856001 is about 1580.4730732375.

The spelling of 3947856001 in words is "three billion, nine hundred forty-seven million, eight hundred fifty-six thousand, one".