4001089 has 2 divisors, whose sum is σ = 4001090. Its totient is φ = 4001088.

The previous prime is 4001071. The next prime is 4001111. The reversal of 4001089 is 9801004.

It is an a-pointer prime, because the next prime (4001111) can be obtained adding 4001089 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4000000 + 1089 = 2000^2 + 33^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4001089 is a prime.

It is a Chen prime.

4001089 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (4001009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000544 + 2000545.

It is an arithmetic number, because the mean of its divisors is an integer number (2000545).

Almost surely, 2^4001089 is an apocalyptic number.

It is an amenable number.

4001089 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001089 is an equidigital number, since it uses as much as digits as its factorization.

4001089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 4001089 is about 2000.2722314725. The cubic root of 4001089 is about 158.7545095543.

It can be divided in two parts, 400 and 1089, that multiplied together give a square (435600 = 660²).

The spelling of 4001089 in words is "four million, one thousand, eighty-nine".