3940820971 has 2 divisors, whose sum is σ = 3940820972. Its totient is φ = 3940820970.

The previous prime is 3940820969. The next prime is 3940820999. The reversal of 3940820971 is 1790280493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3940820971 - 2¹ = 3940820969 is a prime.

Together with 3940820969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3940820921) by changing a digit.

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 as a sum of consecutive naturals, namely, 1970410485 + 1970410486.

It is an arithmetic number, because the mean of its divisors is an integer number (1970410486).

Almost surely, 2^3940820971 is an apocalyptic number.

3940820971 is a deficient number, since it is larger than the sum of its proper divisors (1).

3940820971 is an equidigital number, since it uses as much as digits as its factorization.

3940820971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 3940820971 is about 62775.9585430601. The cubic root of 3940820971 is about 1579.5337206307.

The spelling of 3940820971 in words is "three billion, nine hundred forty million, eight hundred twenty thousand, nine hundred seventy-one".