81386422 has 16 divisors (see below), whose sum is σ = 134269632. Its totient is φ = 36763200.

The previous prime is 81386407. The next prime is 81386471. The reversal of 81386422 is 22468318.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32079 + ... + 34522.

It is an arithmetic number, because the mean of its divisors is an integer number (8391852).

Almost surely, 2^81386422 is an apocalyptic number.

81386422 is a deficient number, since it is larger than the sum of its proper divisors (52883210).

81386422 is a wasteful number, since it uses less digits than its factorization.

81386422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66663.

The product of its digits is 18432, while the sum is 34.

The square root of 81386422 is about 9021.4423458780. The cubic root of 81386422 is about 433.3618254770.

The spelling of 81386422 in words is "eighty-one million, three hundred eighty-six thousand, four hundred twenty-two".