81239826 has 8 divisors (see below), whose sum is σ = 162479664. Its totient is φ = 27079940.

The previous prime is 81239813. The next prime is 81239843. The reversal of 81239826 is 62893218.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

81239826 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6769980 + ... + 6769991.

It is an arithmetic number, because the mean of its divisors is an integer number (20309958).

Almost surely, 2^81239826 is an apocalyptic number.

81239826 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81239826 is a wasteful number, since it uses less digits than its factorization.

81239826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13539976.

The product of its digits is 41472, while the sum is 39.

The square root of 81239826 is about 9013.3138190124. The cubic root of 81239826 is about 433.1014737278.

The spelling of 81239826 in words is "eighty-one million, two hundred thirty-nine thousand, eight hundred twenty-six".