81341838 has 48 divisors (see below), whose sum is σ = 187551936. Its totient is φ = 25390080.

The previous prime is 81341837. The next prime is 81341863. The reversal of 81341838 is 83814318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81341833) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73195 + ... + 74297.

It is an arithmetic number, because the mean of its divisors is an integer number (3907332).

Almost surely, 2^81341838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81341838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93775968).

81341838 is an abundant number, since it is smaller than the sum of its proper divisors (106210098).

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

81341838 is a wasteful number, since it uses less digits than its factorization.

81341838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369 (or 1366 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 81341838 is about 9018.9710056081. The cubic root of 81341838 is about 433.2826782340.

The spelling of 81341838 in words is "eighty-one million, three hundred forty-one thousand, eight hundred thirty-eight".