3981823 has 2 divisors, whose sum is σ = 3981824. Its totient is φ = 3981822.

The previous prime is 3981821. The next prime is 3981827. The reversal of 3981823 is 3281893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3981823 - 2¹ = 3981821 is a prime.

Together with 3981821, it forms a pair of twin primes.

3981823 is a lucky number.

It is a nialpdrome in base 13.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3981821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990911 + 1990912.

It is an arithmetic number, because the mean of its divisors is an integer number (1990912).

Almost surely, 2^3981823 is an apocalyptic number.

3981823 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981823 is an equidigital number, since it uses as much as digits as its factorization.

3981823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 3981823 is about 1995.4505756846. The cubic root of 3981823 is about 158.4992884761.

The spelling of 3981823 in words is "three million, nine hundred eighty-one thousand, eight hundred twenty-three".