9780826381 has 4 divisors (see below), whose sum is σ = 10019383164. Its totient is φ = 9542269600.

The previous prime is 9780826339. The next prime is 9780826411. The reversal of 9780826381 is 1836280879.

9780826381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1114892100 + 8665934281 = 33390^2 + 93091^2 .

It is a cyclic number.

It is not a de Polignac number, because 9780826381 - 2²¹ = 9778729229 is a prime.

It is a super-2 number, since 2×9780826381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9780826301) 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 in 3 ways as a sum of consecutive naturals, for example, 119278330 + ... + 119278411.

It is an arithmetic number, because the mean of its divisors is an integer number (2504845791).

Almost surely, 2^9780826381 is an apocalyptic number.

It is an amenable number.

9780826381 is a deficient number, since it is larger than the sum of its proper divisors (238556783).

9780826381 is a wasteful number, since it uses less digits than its factorization.

9780826381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238556782.

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

The square root of 9780826381 is about 98898.0605522677. The cubic root of 9780826381 is about 2138.5784355289.

The spelling of 9780826381 in words is "nine billion, seven hundred eighty million, eight hundred twenty-six thousand, three hundred eighty-one".