3856999 has 2 divisors, whose sum is σ = 3857000. Its totient is φ = 3856998.

The previous prime is 3856997. The next prime is 3857003. The reversal of 3856999 is 9996583.

It is a weak prime.

It is an emirp because it is prime and its reverse (9996583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3856999 - 2¹ = 3856997 is a prime.

Together with 3856997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3856997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928499 + 1928500.

It is an arithmetic number, because the mean of its divisors is an integer number (1928500).

Almost surely, 2^3856999 is an apocalyptic number.

3856999 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856999 is an equidigital number, since it uses as much as digits as its factorization.

3856999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 49.

The square root of 3856999 is about 1963.9243875465. The cubic root of 3856999 is about 156.8254378546.

The spelling of 3856999 in words is "three million, eight hundred fifty-six thousand, nine hundred ninety-nine".