81384132 has 24 divisors (see below), whose sum is σ = 190226176. Its totient is φ = 27080928.

The previous prime is 81384131. The next prime is 81384157. The reversal of 81384132 is 23148318.

It is a self number, because there is not a number n which added to its sum of digits gives 81384132.

It is not an unprimeable number, because it can be changed into a prime (81384131) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1698 + ... + 12870.

Almost surely, 2^81384132 is an apocalyptic number.

It is an amenable number.

81384132 is an abundant number, since it is smaller than the sum of its proper divisors (108842044).

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

81384132 is a wasteful number, since it uses less digits than its factorization.

81384132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11787 (or 11785 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 81384132 is about 9021.3154251473. The cubic root of 81384132 is about 433.3577608846.

The spelling of 81384132 in words is "eighty-one million, three hundred eighty-four thousand, one hundred thirty-two".