9781239056 has 20 divisors (see below), whose sum is σ = 18963037404. Its totient is φ = 4887552000.

The previous prime is 9781239019. The next prime is 9781239073. The reversal of 9781239056 is 6509321879.

It can be written as a sum of positive squares in 2 ways, for example, as 5440537600 + 4340701456 = 73760^2 + 65884^2 .

It is a super-2 number, since 2×9781239056² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9781238995 and 9781239013.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 165305 + ... + 216536.

Almost surely, 2^9781239056 is an apocalyptic number.

It is an amenable number.

9781239056 is a deficient number, since it is larger than the sum of its proper divisors (9181798348).

9781239056 is a wasteful number, since it uses less digits than its factorization.

9781239056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383450 (or 383444 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 9781239056 is about 98900.1468957453. The cubic root of 9781239056 is about 2138.6085122460.

The spelling of 9781239056 in words is "nine billion, seven hundred eighty-one million, two hundred thirty-nine thousand, fifty-six".