4490989 has 2 divisors, whose sum is σ = 4490990. Its totient is φ = 4490988.

The previous prime is 4490987. The next prime is 4490999. The reversal of 4490989 is 9890944.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4338889 + 152100 = 2083^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 4490989 - 2¹ = 4490987 is a prime.

Together with 4490987, it forms a pair of twin primes.

4490989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4490987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2245494 + 2245495.

It is an arithmetic number, because the mean of its divisors is an integer number (2245495).

Almost surely, 2^4490989 is an apocalyptic number.

It is an amenable number.

4490989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4490989 is an equidigital number, since it uses as much as digits as its factorization.

4490989 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 4490989 is about 2119.1953661708. The cubic root of 4490989 is about 164.9860900426.

The spelling of 4490989 in words is "four million, four hundred ninety thousand, nine hundred eighty-nine".