81794396 has 6 divisors (see below), whose sum is σ = 143140200. Its totient is φ = 40897196.

The previous prime is 81794389. The next prime is 81794407. The reversal of 81794396 is 69349718.

It is a self number, because there is not a number n which added to its sum of digits gives 81794396.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10224296 + ... + 10224303.

It is an arithmetic number, because the mean of its divisors is an integer number (23856700).

Almost surely, 2^81794396 is an apocalyptic number.

It is an amenable number.

81794396 is a deficient number, since it is larger than the sum of its proper divisors (61345804).

81794396 is a wasteful number, since it uses less digits than its factorization.

81794396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20448603 (or 20448601 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 81794396 is about 9044.0254311894. The cubic root of 81794396 is about 434.0847378552.

The spelling of 81794396 in words is "eighty-one million, seven hundred ninety-four thousand, three hundred ninety-six".