81238 has 8 divisors (see below), whose sum is σ = 123120. Its totient is φ = 40200.

The previous prime is 81233. The next prime is 81239. The reversal of 81238 is 83218.

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

It is a super-2 number, since 2×81238² = 13199225288, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168 + ... + 436.

It is an arithmetic number, because the mean of its divisors is an integer number (15390).

2⁸¹²³⁸ is an apocalyptic number.

81238 is a deficient number, since it is larger than the sum of its proper divisors (41882).

81238 is a wasteful number, since it uses less digits than its factorization.

81238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422.

The product of its digits is 384, while the sum is 22.

The square root of 81238 is about 285.0228061051. The cubic root of 81238 is about 43.3098228812.

The spelling of 81238 in words is "eighty-one thousand, two hundred thirty-eight".