2489869 has 2 divisors, whose sum is σ = 2489870. Its totient is φ = 2489868.

The previous prime is 2489867. The next prime is 2489873. The reversal of 2489869 is 9689842.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1562500 + 927369 = 1250^2 + 963^2 .

It is a cyclic number.

It is not a de Polignac number, because 2489869 - 2¹ = 2489867 is a prime.

It is a super-2 number, since 2×2489869² = 12398895274322, which contains 22 as substring.

Together with 2489867, 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 (2489867) 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, 1244934 + 1244935.

It is an arithmetic number, because the mean of its divisors is an integer number (1244935).

2^2489869 is an apocalyptic number.

It is an amenable number.

2489869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2489869 is an equidigital number, since it uses as much as digits as its factorization.

2489869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 2489869 is about 1577.9318743216. The cubic root of 2489869 is about 135.5373008603.

The spelling of 2489869 in words is "two million, four hundred eighty-nine thousand, eight hundred sixty-nine".