3921559 has 2 divisors, whose sum is σ = 3921560. Its totient is φ = 3921558.

The previous prime is 3921551. The next prime is 3921601. The reversal of 3921559 is 9551293.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3921559 - 2³ = 3921551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3921551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960779 + 1960780.

It is an arithmetic number, because the mean of its divisors is an integer number (1960780).

Almost surely, 2^3921559 is an apocalyptic number.

3921559 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921559 is an equidigital number, since it uses as much as digits as its factorization.

3921559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12150, while the sum is 34.

The square root of 3921559 is about 1980.2926551396. The cubic root of 3921559 is about 157.6956031160.

The spelling of 3921559 in words is "three million, nine hundred twenty-one thousand, five hundred fifty-nine".