81935384 has 32 divisors (see below), whose sum is σ = 164233440. Its totient is φ = 38227200.

The previous prime is 81935369. The next prime is 81935389. The reversal of 81935384 is 48353918.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81935389) 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 7 ways as a sum of consecutive naturals, for example, 2114 + ... + 12974.

It is an arithmetic number, because the mean of its divisors is an integer number (5132295).

Almost surely, 2^81935384 is an apocalyptic number.

It is an amenable number.

81935384 is an abundant number, since it is smaller than the sum of its proper divisors (82298056).

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

81935384 is a wasteful number, since it uses less digits than its factorization.

81935384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10931 (or 10927 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 81935384 is about 9051.8166132550. The cubic root of 81935384 is about 434.3340035425.

The spelling of 81935384 in words is "eighty-one million, nine hundred thirty-five thousand, three hundred eighty-four".