857235438 has 72 divisors (see below), whose sum is σ = 2058000048. Its totient is φ = 256506624.

The previous prime is 857235433. The next prime is 857235439. The reversal of 857235438 is 834532758.

857235438 is a `hidden beast` number, since 8 + 572 + 35 + 43 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 857235393 and 857235402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857235433) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2456088 + ... + 2456436.

It is an arithmetic number, because the mean of its divisors is an integer number (28583334).

Almost surely, 2^857235438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857235438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1029000024).

857235438 is an abundant number, since it is smaller than the sum of its proper divisors (1200764610).

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

857235438 is a wasteful number, since it uses less digits than its factorization.

857235438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 394 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 857235438 is about 29278.5832649054. The cubic root of 857235438 is about 949.9484507578.

The spelling of 857235438 in words is "eight hundred fifty-seven million, two hundred thirty-five thousand, four hundred thirty-eight".