1864587449 has 2 divisors, whose sum is σ = 1864587450. Its totient is φ = 1864587448.

The previous prime is 1864587407. The next prime is 1864587499. The reversal of 1864587449 is 9447854681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1603441849 + 261145600 = 40043^2 + 16160^2 .

It is an emirp because it is prime and its reverse (9447854681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1864587449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1864587394 and 1864587403.

It is not a weakly prime, because it can be changed into another prime (1864587499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932293724 + 932293725.

It is an arithmetic number, because the mean of its divisors is an integer number (932293725).

Almost surely, 2^1864587449 is an apocalyptic number.

It is an amenable number.

1864587449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864587449 is an equidigital number, since it uses as much as digits as its factorization.

1864587449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7741440, while the sum is 56.

The square root of 1864587449 is about 43180.8690162669. The cubic root of 1864587449 is about 1230.8191711960.

The spelling of 1864587449 in words is "one billion, eight hundred sixty-four million, five hundred eighty-seven thousand, four hundred forty-nine".