861909026 has 16 divisors (see below), whose sum is σ = 1416257568. Its totient is φ = 390148800.

The previous prime is 861909007. The next prime is 861909031. The reversal of 861909026 is 620909168.

861909026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 75980 + ... + 86583.

It is an arithmetic number, because the mean of its divisors is an integer number (88516098).

Almost surely, 2^861909026 is an apocalyptic number.

861909026 is a deficient number, since it is larger than the sum of its proper divisors (554348542).

861909026 is a wasteful number, since it uses less digits than its factorization.

861909026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162817.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 861909026 is about 29358.2871775586. The cubic root of 861909026 is about 951.6716738770.

The spelling of 861909026 in words is "eight hundred sixty-one million, nine hundred nine thousand, twenty-six".