4205989 has 2 divisors, whose sum is σ = 4205990. Its totient is φ = 4205988.

The previous prime is 4205977. The next prime is 4206019. The reversal of 4205989 is 9895024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4133089 + 72900 = 2033^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 4205989 - 2¹³ = 4197797 is a prime.

4205989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4205909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2102994 + 2102995.

It is an arithmetic number, because the mean of its divisors is an integer number (2102995).

Almost surely, 2^4205989 is an apocalyptic number.

It is an amenable number.

4205989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4205989 is an equidigital number, since it uses as much as digits as its factorization.

4205989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 4205989 is about 2050.8507990588. The cubic root of 4205989 is about 161.4195172603.

The spelling of 4205989 in words is "four million, two hundred five thousand, nine hundred eighty-nine".