4089949 has 2 divisors, whose sum is σ = 4089950. Its totient is φ = 4089948.

The previous prime is 4089947. The next prime is 4089973. The reversal of 4089949 is 9499804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3829849 + 260100 = 1957^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 4089949 - 2¹ = 4089947 is a prime.

Together with 4089947, 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 (4089947) 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 as a sum of consecutive naturals, namely, 2044974 + 2044975.

It is an arithmetic number, because the mean of its divisors is an integer number (2044975).

Almost surely, 2^4089949 is an apocalyptic number.

It is an amenable number.

4089949 is a deficient number, since it is larger than the sum of its proper divisors (1).

4089949 is an equidigital number, since it uses as much as digits as its factorization.

4089949 is an odious number, because the sum of its binary digits is odd.

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

The square root of 4089949 is about 2022.3622326379. The cubic root of 4089949 is about 159.9211721074.

The spelling of 4089949 in words is "four million, eighty-nine thousand, nine hundred forty-nine".