861838947 has 10 divisors (see below), whose sum is σ = 1287438548. Its totient is φ = 574559244.

The previous prime is 861838937. The next prime is 861838973. The reversal of 861838947 is 749838168.

It is not a de Polignac number, because 861838947 - 2⁴ = 861838931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861838893 and 861838902.

It is not an unprimeable number, because it can be changed into a prime (861838937) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5319913 + ... + 5320074.

Almost surely, 2^861838947 is an apocalyptic number.

861838947 is a deficient number, since it is larger than the sum of its proper divisors (425599601).

861838947 is a wasteful number, since it uses less digits than its factorization.

861838947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10639999 (or 10639990 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 861838947 is about 29357.0936402090. The cubic root of 861838947 is about 951.6458807423.

The spelling of 861838947 in words is "eight hundred sixty-one million, eight hundred thirty-eight thousand, nine hundred forty-seven".