861261838 has 8 divisors (see below), whose sum is σ = 1292021280. Its totient is φ = 430588080.

The previous prime is 861261833. The next prime is 861261847. The reversal of 861261838 is 838162168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 861261794 and 861261803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861261833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18858 + ... + 45586.

It is an arithmetic number, because the mean of its divisors is an integer number (161502660).

Almost surely, 2^861261838 is an apocalyptic number.

861261838 is a deficient number, since it is larger than the sum of its proper divisors (430759442).

861261838 is a wasteful number, since it uses less digits than its factorization.

861261838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42842.

The product of its digits is 110592, while the sum is 43.

The square root of 861261838 is about 29347.2628706665. The cubic root of 861261838 is about 951.4334179858.

The spelling of 861261838 in words is "eight hundred sixty-one million, two hundred sixty-one thousand, eight hundred thirty-eight".