81794442 has 16 divisors (see below), whose sum is σ = 169230240. Its totient is φ = 26324592.

The previous prime is 81794441. The next prime is 81794459. The reversal of 81794442 is 24449718.

It is a self number, because there is not a number n which added to its sum of digits gives 81794442.

It is not an unprimeable number, because it can be changed into a prime (81794441) 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, 234868 + ... + 235215.

It is an arithmetic number, because the mean of its divisors is an integer number (10576890).

Almost surely, 2^81794442 is an apocalyptic number.

81794442 is an abundant number, since it is smaller than the sum of its proper divisors (87435798).

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

81794442 is a wasteful number, since it uses less digits than its factorization.

81794442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470117.

The product of its digits is 64512, while the sum is 39.

The square root of 81794442 is about 9044.0279743044. The cubic root of 81794442 is about 434.0848192296.

It can be divided in two parts, 8179 and 4442, that added together give a palindrome (12621).

The spelling of 81794442 in words is "eighty-one million, seven hundred ninety-four thousand, four hundred forty-two".