3971587 has 2 divisors, whose sum is σ = 3971588. Its totient is φ = 3971586.

The previous prime is 3971581. The next prime is 3971599. The reversal of 3971587 is 7851793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3971587 - 2⁷ = 3971459 is a prime.

3971587 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3971581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985793 + 1985794.

It is an arithmetic number, because the mean of its divisors is an integer number (1985794).

Almost surely, 2^3971587 is an apocalyptic number.

3971587 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971587 is an equidigital number, since it uses as much as digits as its factorization.

3971587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 3971587 is about 1992.8840909596. The cubic root of 3971587 is about 158.3633548490.

The spelling of 3971587 in words is "three million, nine hundred seventy-one thousand, five hundred eighty-seven".