3947636747 has 2 divisors, whose sum is σ = 3947636748. Its totient is φ = 3947636746.

The previous prime is 3947636729. The next prime is 3947636773. The reversal of 3947636747 is 7476367493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3947636747 - 2⁸ = 3947636491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3947636692 and 3947636701.

It is not a weakly prime, because it can be changed into another prime (3947636447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973818373 + 1973818374.

It is an arithmetic number, because the mean of its divisors is an integer number (1973818374).

Almost surely, 2^3947636747 is an apocalyptic number.

3947636747 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947636747 is an equidigital number, since it uses as much as digits as its factorization.

3947636747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16003008, while the sum is 56.

The square root of 3947636747 is about 62830.2216055299. The cubic root of 3947636747 is about 1580.4438141951.

The spelling of 3947636747 in words is "three billion, nine hundred forty-seven million, six hundred thirty-six thousand, seven hundred forty-seven".