85438 has 4 divisors (see below), whose sum is σ = 128160. Its totient is φ = 42718.

The previous prime is 85429. The next prime is 85439. The reversal of 85438 is 83458.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83458 = 2 ⋅41729.

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 (85439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21358 + ... + 21361.

It is an arithmetic number, because the mean of its divisors is an integer number (32040).

2⁸⁵⁴³⁸ is an apocalyptic number.

85438 is a deficient number, since it is larger than the sum of its proper divisors (42722).

85438 is a wasteful number, since it uses less digits than its factorization.

85438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42721.

The product of its digits is 3840, while the sum is 28.

The square root of 85438 is about 292.2977933547. The cubic root of 85438 is about 44.0436893870.

The spelling of 85438 in words is "eighty-five thousand, four hundred thirty-eight".