81855926 has 8 divisors (see below), whose sum is σ = 125778744. Its totient is φ = 39929680.

The previous prime is 81855913. The next prime is 81855931. The reversal of 81855926 is 62955818.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499040 + ... + 499203.

It is an arithmetic number, because the mean of its divisors is an integer number (15722343).

Almost surely, 2^81855926 is an apocalyptic number.

81855926 is a deficient number, since it is larger than the sum of its proper divisors (43922818).

81855926 is a wasteful number, since it uses less digits than its factorization.

81855926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998286.

The product of its digits is 172800, while the sum is 44.

The square root of 81855926 is about 9047.4264849182. The cubic root of 81855926 is about 434.1935576141.

The spelling of 81855926 in words is "eighty-one million, eight hundred fifty-five thousand, nine hundred twenty-six".