4049989 has 2 divisors, whose sum is σ = 4049990. Its totient is φ = 4049988.

The previous prime is 4049987. The next prime is 4050019. The reversal of 4049989 is 9899404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3833764 + 216225 = 1958^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 4049989 - 2¹ = 4049987 is a prime.

Together with 4049987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4049987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2024994 + 2024995.

It is an arithmetic number, because the mean of its divisors is an integer number (2024995).

Almost surely, 2^4049989 is an apocalyptic number.

It is an amenable number.

4049989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4049989 is an equidigital number, since it uses as much as digits as its factorization.

4049989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 4049989 is about 2012.4584467760. The cubic root of 4049989 is about 159.3986410656.

The spelling of 4049989 in words is "four million, forty-nine thousand, nine hundred eighty-nine".