81489386 has 48 divisors (see below), whose sum is σ = 141571584. Its totient is φ = 35112000.

The previous prime is 81489349. The next prime is 81489403. The reversal of 81489386 is 68398418.

It is a super-3 number, since 3×81489386³ (a number of 25 digits) contains 333 as substring.

Its product of digits (331776) is a multiple of the sum of its prime divisors (288).

It is a self number, because there is not a number n which added to its sum of digits gives 81489386.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 426551 + ... + 426741.

It is an arithmetic number, because the mean of its divisors is an integer number (2949408).

Almost surely, 2^81489386 is an apocalyptic number.

81489386 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

81489386 is a deficient number, since it is larger than the sum of its proper divisors (60082198).

81489386 is a wasteful number, since it uses less digits than its factorization.

81489386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 288 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 81489386 is about 9027.1471684027. The cubic root of 81489386 is about 433.5445007612.

The spelling of 81489386 in words is "eighty-one million, four hundred eighty-nine thousand, three hundred eighty-six".