85821438 has 8 divisors (see below), whose sum is σ = 171642888. Its totient is φ = 28607144.

The previous prime is 85821409. The next prime is 85821443. The reversal of 85821438 is 83412858.

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

85821438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 85821396 and 85821405.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 7151781 + ... + 7151792.

It is an arithmetic number, because the mean of its divisors is an integer number (21455361).

Almost surely, 2^85821438 is an apocalyptic number.

85821438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85821438 is a wasteful number, since it uses less digits than its factorization.

85821438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14303578.

The product of its digits is 61440, while the sum is 39.

The square root of 85821438 is about 9263.9860751191. The cubic root of 85821438 is about 441.0947909420.

The spelling of 85821438 in words is "eighty-five million, eight hundred twenty-one thousand, four hundred thirty-eight".