81386349 has 8 divisors (see below), whose sum is σ = 118380192. Its totient is φ = 49325040.

The previous prime is 81386339. The next prime is 81386381. The reversal of 81386349 is 94368318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81386349 - 2¹⁷ = 81255277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81386349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81386309) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1233094 + ... + 1233159.

It is an arithmetic number, because the mean of its divisors is an integer number (14797524).

Almost surely, 2^81386349 is an apocalyptic number.

It is an amenable number.

81386349 is a deficient number, since it is larger than the sum of its proper divisors (36993843).

81386349 is a wasteful number, since it uses less digits than its factorization.

81386349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466267.

The product of its digits is 124416, while the sum is 42.

The square root of 81386349 is about 9021.4382999608. The cubic root of 81386349 is about 433.3616959082.

The spelling of 81386349 in words is "eighty-one million, three hundred eighty-six thousand, three hundred forty-nine".