3957847987 has 2 divisors, whose sum is σ = 3957847988. Its totient is φ = 3957847986.

The previous prime is 3957847973. The next prime is 3957847997. The reversal of 3957847987 is 7897487593.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7897487593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3957847987 - 2¹⁵ = 3957815219 is a prime.

It is not a weakly prime, because it can be changed into another prime (3957847997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1978923993 + 1978923994.

It is an arithmetic number, because the mean of its divisors is an integer number (1978923994).

Almost surely, 2^3957847987 is an apocalyptic number.

3957847987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3957847987 is an equidigital number, since it uses as much as digits as its factorization.

3957847987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 106686720, while the sum is 67.

The square root of 3957847987 is about 62911.4297008103. The cubic root of 3957847987 is about 1581.8053373264.

The spelling of 3957847987 in words is "three billion, nine hundred fifty-seven million, eight hundred forty-seven thousand, nine hundred eighty-seven".