1798405825 has 6 divisors (see below), whose sum is σ = 2230023254. Its totient is φ = 1438724640.

The previous prime is 1798405801. The next prime is 1798405897. The reversal of 1798405825 is 5285048971.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 125350416 + 1673055409 = 11196^2 + 40903^2 .

It is not a de Polignac number, because 1798405825 - 2¹⁹ = 1797881537 is a prime.

It is a super-2 number, since 2×1798405825² = 6468527022787861250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 35968092 + ... + 35968141.

Almost surely, 2^1798405825 is an apocalyptic number.

It is an amenable number.

1798405825 is a deficient number, since it is larger than the sum of its proper divisors (431617429).

1798405825 is an equidigital number, since it uses as much as digits as its factorization.

1798405825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71936243 (or 71936238 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 49.

The square root of 1798405825 is about 42407.6151769939. The cubic root of 1798405825 is about 1216.0811784394.

The spelling of 1798405825 in words is "one billion, seven hundred ninety-eight million, four hundred five thousand, eight hundred twenty-five".