81794405 has 16 divisors (see below), whose sum is σ = 122373504. Its totient is φ = 50988480.

The previous prime is 81794389. The next prime is 81794407. The reversal of 81794405 is 50449718.

It is not a de Polignac number, because 81794405 - 2⁴ = 81794389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81794407) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 105842 + ... + 106611.

It is an arithmetic number, because the mean of its divisors is an integer number (7648344).

Almost surely, 2^81794405 is an apocalyptic number.

It is an amenable number.

81794405 is a deficient number, since it is larger than the sum of its proper divisors (40579099).

81794405 is a wasteful number, since it uses less digits than its factorization.

81794405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212476.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 81794405 is about 9044.0259287554. The cubic root of 81794405 is about 434.0847537763.

The spelling of 81794405 in words is "eighty-one million, seven hundred ninety-four thousand, four hundred five".