4006889 has 4 divisors (see below), whose sum is σ = 4104660. Its totient is φ = 3909120.

The previous prime is 4006879. The next prime is 4006913. The reversal of 4006889 is 9886004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 270400 + 3736489 = 520^2 + 1933^2 .

It is a cyclic number.

It is not a de Polignac number, because 4006889 - 2⁸ = 4006633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4006859) 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 in 3 ways as a sum of consecutive naturals, for example, 48824 + ... + 48905.

It is an arithmetic number, because the mean of its divisors is an integer number (1026165).

Almost surely, 2^4006889 is an apocalyptic number.

It is an amenable number.

4006889 is a deficient number, since it is larger than the sum of its proper divisors (97771).

4006889 is an equidigital number, since it uses as much as digits as its factorization.

4006889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97770.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 4006889 is about 2001.7215091016. The cubic root of 4006889 is about 158.8311829793.

It can be divided in two parts, 400 and 6889, that multiplied together give a square (2755600 = 1660²).

The spelling of 4006889 in words is "four million, six thousand, eight hundred eighty-nine".