81843954 has 16 divisors (see below), whose sum is σ = 167680800. Its totient is φ = 26615840.

The previous prime is 81843941. The next prime is 81843961. The reversal of 81843954 is 45934818.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166104 + ... + 166595.

It is an arithmetic number, because the mean of its divisors is an integer number (10480050).

Almost surely, 2^81843954 is an apocalyptic number.

81843954 is an abundant number, since it is smaller than the sum of its proper divisors (85836846).

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

81843954 is a wasteful number, since it uses less digits than its factorization.

81843954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332745.

The product of its digits is 138240, while the sum is 42.

The square root of 81843954 is about 9046.7648361168. The cubic root of 81843954 is about 434.1723886368.

The spelling of 81843954 in words is "eighty-one million, eight hundred forty-three thousand, nine hundred fifty-four".