857424 has 20 divisors (see below), whose sum is σ = 2215136. Its totient is φ = 285792.

The previous prime is 857419. The next prime is 857431. The reversal of 857424 is 424758.

857424 = T₄₃₂ + T₄₃₃ + ... + T₄₄₀.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 8² + 5² + 4⁵ + 7⁷ + 2¹⁴ + 4⁷ .

It is a junction number, because it is equal to n+sod(n) for n = 857391 and 857400.

It is a congruent number.

It is an unprimeable number.

857424 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 in 3 ways as a sum of consecutive naturals, for example, 8884 + ... + 8979.

2⁸⁵⁷⁴²⁴ is an apocalyptic number.

It is an amenable number.

857424 is an abundant number, since it is smaller than the sum of its proper divisors (1357712).

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

857424 is a wasteful number, since it uses less digits than its factorization.

857424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17874 (or 17868 counting only the distinct ones).

The product of its digits is 8960, while the sum is 30.

The square root of 857424 is about 925.9719218205. The cubic root of 857424 is about 95.0018097532.

The spelling of 857424 in words is "eight hundred fifty-seven thousand, four hundred twenty-four".