1817281940356 has 81 divisors (see below), whose sum is σ = 3493545817797. Its totient is φ = 826957607040.

The previous prime is 1817281940303. The next prime is 1817281940389. The reversal of 1817281940356 is 6530491827181.

The square root of 1817281940356 is 1348066.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1414838880900 + 402443059456 = 1189470^2 + 634384^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1817281940297 and 1817281940306.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1420860925 + ... + 1420862203.

It is a 1-persistent number, because it is pandigital, but 2⋅1817281940356 = 3634563880712 is not.

Almost surely, 2^{1817281940356} is an apocalyptic number.

1817281940356 is the 1348066-th square number.

It is an amenable number.

1817281940356 is a deficient number, since it is larger than the sum of its proper divisors (1676263877441).

1817281940356 is an equidigital number, since it uses as much as digits as its factorization.

1817281940356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 1817281940356 in words is "one trillion, eight hundred seventeen billion, two hundred eighty-one million, nine hundred forty thousand, three hundred fifty-six".