3885991 has 2 divisors, whose sum is σ = 3885992. Its totient is φ = 3885990.

The previous prime is 3885989. The next prime is 3885997. The reversal of 3885991 is 1995883.

It is a weak prime.

It is an emirp because it is prime and its reverse (1995883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3885991 - 2¹ = 3885989 is a prime.

Together with 3885989, 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 (3885997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1942995 + 1942996.

It is an arithmetic number, because the mean of its divisors is an integer number (1942996).

Almost surely, 2^3885991 is an apocalyptic number.

3885991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3885991 is an equidigital number, since it uses as much as digits as its factorization.

3885991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 3885991 is about 1971.2917084998. The cubic root of 3885991 is about 157.2173952957.

The spelling of 3885991 in words is "three million, eight hundred eighty-five thousand, nine hundred ninety-one".