3971260387 has 2 divisors, whose sum is σ = 3971260388. Its totient is φ = 3971260386.

The previous prime is 3971260379. The next prime is 3971260393. The reversal of 3971260387 is 7830621793.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3971260387 - 2³ = 3971260379 is a prime.

It is a super-2 number, since 2×3971260387² = 31541818122710779538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3971260327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985630193 + 1985630194.

It is an arithmetic number, because the mean of its divisors is an integer number (1985630194).

Almost surely, 2^3971260387 is an apocalyptic number.

3971260387 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971260387 is an equidigital number, since it uses as much as digits as its factorization.

3971260387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 3971260387 is about 63017.9370258976. The cubic root of 3971260387 is about 1583.5901359964.

The spelling of 3971260387 in words is "three billion, nine hundred seventy-one million, two hundred sixty thousand, three hundred eighty-seven".