4047889 has 4 divisors (see below), whose sum is σ = 4146660. Its totient is φ = 3949120.

The previous prime is 4047847. The next prime is 4047929. The reversal of 4047889 is 9887404.

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 588289 + 3459600 = 767^2 + 1860^2 .

It is not a de Polignac number, because 4047889 - 2⁷ = 4047761 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4047829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49324 + ... + 49405.

It is an arithmetic number, because the mean of its divisors is an integer number (1036665).

Almost surely, 2^4047889 is an apocalyptic number.

It is an amenable number.

4047889 is a deficient number, since it is larger than the sum of its proper divisors (98771).

4047889 is an equidigital number, since it uses as much as digits as its factorization.

4047889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98770.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 4047889 is about 2011.9366292207. The cubic root of 4047889 is about 159.3710858452.

The spelling of 4047889 in words is "four million, forty-seven thousand, eight hundred eighty-nine".