9781039138 has 16 divisors (see below), whose sum is σ = 16000145280. Its totient is φ = 4457181456.

The previous prime is 9781039129. The next prime is 9781039141. The reversal of 9781039138 is 8319301879.

It is a junction number, because it is equal to n+sod(n) for n = 9781039091 and 9781039100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2378920 + ... + 2383027.

It is an arithmetic number, because the mean of its divisors is an integer number (1000009080).

Almost surely, 2^9781039138 is an apocalyptic number.

9781039138 is a deficient number, since it is larger than the sum of its proper divisors (6219106142).

9781039138 is a wasteful number, since it uses less digits than its factorization.

9781039138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4762041.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 9781039138 is about 98899.1361842964. The cubic root of 9781039138 is about 2138.5939418612.

The spelling of 9781039138 in words is "nine billion, seven hundred eighty-one million, thirty-nine thousand, one hundred thirty-eight".