4000889 has 2 divisors, whose sum is σ = 4000890. Its totient is φ = 4000888.

The previous prime is 4000883. The next prime is 4000897. The reversal of 4000889 is 9880004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3534400 + 466489 = 1880^2 + 683^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000889 - 2¹² = 3996793 is a prime.

It is a super-2 number, since 2×4000889² = 32014225580642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4000883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000444 + 2000445.

It is an arithmetic number, because the mean of its divisors is an integer number (2000445).

Almost surely, 2^4000889 is an apocalyptic number.

It is an amenable number.

4000889 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000889 is an equidigital number, since it uses as much as digits as its factorization.

4000889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 4000889 is about 2000.2222376526. Note that the first 4 decimals coincide. The cubic root of 4000889 is about 158.7518643218.

The spelling of 4000889 in words is "four million, eight hundred eighty-nine", and thus it is an aban number.