3921287 has 2 divisors, whose sum is σ = 3921288. Its totient is φ = 3921286.

The previous prime is 3921227. The next prime is 3921289. The reversal of 3921287 is 7821293.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3921287 - 2¹⁰ = 3920263 is a prime.

Together with 3921289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3921289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960643 + 1960644.

It is an arithmetic number, because the mean of its divisors is an integer number (1960644).

Almost surely, 2^3921287 is an apocalyptic number.

3921287 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921287 is an equidigital number, since it uses as much as digits as its factorization.

3921287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 3921287 is about 1980.2239772309. The cubic root of 3921287 is about 157.6919571005.

The spelling of 3921287 in words is "three million, nine hundred twenty-one thousand, two hundred eighty-seven".