3945643547 has 2 divisors, whose sum is σ = 3945643548. Its totient is φ = 3945643546.

The previous prime is 3945643519. The next prime is 3945643571. The reversal of 3945643547 is 7453465493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3945643547 - 2⁸ = 3945643291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3945643495 and 3945643504.

It is not a weakly prime, because it can be changed into another prime (3945643147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972821773 + 1972821774.

It is an arithmetic number, because the mean of its divisors is an integer number (1972821774).

Almost surely, 2^3945643547 is an apocalyptic number.

3945643547 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945643547 is an equidigital number, since it uses as much as digits as its factorization.

3945643547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 50.

The square root of 3945643547 is about 62814.3578093416. The cubic root of 3945643547 is about 1580.1777756223.

The spelling of 3945643547 in words is "three billion, nine hundred forty-five million, six hundred forty-three thousand, five hundred forty-seven".