3856997 has 2 divisors, whose sum is σ = 3856998. Its totient is φ = 3856996.

The previous prime is 3856987. The next prime is 3856999. The reversal of 3856997 is 7996583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2660161 + 1196836 = 1631^2 + 1094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3856997 is a prime.

Together with 3856999, 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 (3856999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928498 + 1928499.

It is an arithmetic number, because the mean of its divisors is an integer number (1928499).

Almost surely, 2^3856997 is an apocalyptic number.

It is an amenable number.

3856997 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856997 is an equidigital number, since it uses as much as digits as its factorization.

3856997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 3856997 is about 1963.9238783619. The cubic root of 3856997 is about 156.8254107480.

The spelling of 3856997 in words is "three million, eight hundred fifty-six thousand, nine hundred ninety-seven".