81839926 has 8 divisors (see below), whose sum is σ = 140297040. Its totient is φ = 35074248.

The previous prime is 81839917. The next prime is 81839941. The reversal of 81839926 is 62993818.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2922841 + ... + 2922868.

It is an arithmetic number, because the mean of its divisors is an integer number (17537130).

Almost surely, 2^81839926 is an apocalyptic number.

81839926 is a deficient number, since it is larger than the sum of its proper divisors (58457114).

81839926 is a wasteful number, since it uses less digits than its factorization.

81839926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5845718.

The product of its digits is 186624, while the sum is 46.

The square root of 81839926 is about 9046.5422123594. The cubic root of 81839926 is about 434.1652658339.

The spelling of 81839926 in words is "eighty-one million, eight hundred thirty-nine thousand, nine hundred twenty-six".