4405991 has 2 divisors, whose sum is σ = 4405992. Its totient is φ = 4405990.

The previous prime is 4405979. The next prime is 4406021. The reversal of 4405991 is 1995044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4405991 - 2⁶ = 4405927 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4405591) 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, 2202995 + 2202996.

It is an arithmetic number, because the mean of its divisors is an integer number (2202996).

Almost surely, 2^4405991 is an apocalyptic number.

4405991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4405991 is an equidigital number, since it uses as much as digits as its factorization.

4405991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 4405991 is about 2099.0452591595. The cubic root of 4405991 is about 163.9385924171.

The spelling of 4405991 in words is "four million, four hundred five thousand, nine hundred ninety-one".