81392 has 10 divisors (see below), whose sum is σ = 157728. Its totient is φ = 40688.

The previous prime is 81373. The next prime is 81401. The reversal of 81392 is 29318.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81392.

It is an unprimeable number.

81392 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2528 + ... + 2559.

2⁸¹³⁹² is an apocalyptic number.

It is an amenable number.

81392 is a deficient number, since it is larger than the sum of its proper divisors (76336).

81392 is a wasteful number, since it uses less digits than its factorization.

81392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095 (or 5089 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 81392 is about 285.2928320165. The cubic root of 81392 is about 43.3371725724.

The spelling of 81392 in words is "eighty-one thousand, three hundred ninety-two".