1827904489 has 2 divisors, whose sum is σ = 1827904490. Its totient is φ = 1827904488.

The previous prime is 1827904459. The next prime is 1827904531. The reversal of 1827904489 is 9844097281.

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., 1807950400 + 19954089 = 42520^2 + 4467^2 .

It is an emirp because it is prime and its reverse (9844097281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1827904489 - 2²⁵ = 1794350057 is a prime.

It is a super-2 number, since 2×1827904489² = 6682469641812702242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1827904409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 913952244 + 913952245.

It is an arithmetic number, because the mean of its divisors is an integer number (913952245).

Almost surely, 2^1827904489 is an apocalyptic number.

It is an amenable number.

1827904489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1827904489 is an equidigital number, since it uses as much as digits as its factorization.

1827904489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 1827904489 is about 42753.9996842401. Note that the first 3 decimals coincide. The cubic root of 1827904489 is about 1222.6941466463.

The spelling of 1827904489 in words is "one billion, eight hundred twenty-seven million, nine hundred four thousand, four hundred eighty-nine".