861549834 has 16 divisors (see below), whose sum is σ = 1824458688. Its totient is φ = 270290112.

The previous prime is 861549833. The next prime is 861549863. The reversal of 861549834 is 438945168.

It is not an unprimeable number, because it can be changed into a prime (861549833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4223182 + ... + 4223385.

It is an arithmetic number, because the mean of its divisors is an integer number (114028668).

Almost surely, 2^861549834 is an apocalyptic number.

861549834 is an abundant number, since it is smaller than the sum of its proper divisors (962908854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861549834 is a wasteful number, since it uses less digits than its factorization.

861549834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8446589.

The product of its digits is 829440, while the sum is 48.

The square root of 861549834 is about 29352.1691532330. The cubic root of 861549834 is about 951.5394556120.

The spelling of 861549834 in words is "eight hundred sixty-one million, five hundred forty-nine thousand, eight hundred thirty-four".