3989723 has 2 divisors, whose sum is σ = 3989724. Its totient is φ = 3989722.

The previous prime is 3989701. The next prime is 3989729. The reversal of 3989723 is 3279893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3989723 - 2⁸ = 3989467 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3989729) 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, 1994861 + 1994862.

It is an arithmetic number, because the mean of its divisors is an integer number (1994862).

Almost surely, 2^3989723 is an apocalyptic number.

3989723 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989723 is an equidigital number, since it uses as much as digits as its factorization.

3989723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 3989723 is about 1997.4290976152. The cubic root of 3989723 is about 158.6040409307.

The spelling of 3989723 in words is "three million, nine hundred eighty-nine thousand, seven hundred twenty-three".