3945997009 has 2 divisors, whose sum is σ = 3945997010. Its totient is φ = 3945997008.

The previous prime is 3945996941. The next prime is 3945997031. The reversal of 3945997009 is 9007995493.

3945997009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3908750400 + 37246609 = 62520^2 + 6103^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945997009 - 2¹⁵ = 3945964241 is a prime.

It is not a weakly prime, because it can be changed into another prime (3945997609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972998504 + 1972998505.

It is an arithmetic number, because the mean of its divisors is an integer number (1972998505).

Almost surely, 2^3945997009 is an apocalyptic number.

It is an amenable number.

3945997009 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945997009 is an equidigital number, since it uses as much as digits as its factorization.

3945997009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2755620, while the sum is 55.

The square root of 3945997009 is about 62817.1712909774. The cubic root of 3945997009 is about 1580.2249598237.

The spelling of 3945997009 in words is "three billion, nine hundred forty-five million, nine hundred ninety-seven thousand, nine".