857428 has 24 divisors (see below), whose sum is σ = 1764000. Its totient is φ = 359520.

The previous prime is 857419. The next prime is 857431. The reversal of 857428 is 824758.

It is a d-powerful number, because it can be written as 8² + 5² + 4 + 7⁷ + 2¹⁰ + 8⁵ .

It is a junction number, because it is equal to n+sod(n) for n = 857393 and 857402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (73500).

2⁸⁵⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

857428 is an abundant number, since it is smaller than the sum of its proper divisors (906572).

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

857428 is a wasteful number, since it uses less digits than its factorization.

857428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527 (or 1525 counting only the distinct ones).

The product of its digits is 17920, while the sum is 34.

The square root of 857428 is about 925.9740817107. The cubic root of 857428 is about 95.0019574851.

It can be divided in two parts, 857 and 428, that multiplied together give a triangular number (366796 = T₈₅₆).

The spelling of 857428 in words is "eight hundred fifty-seven thousand, four hundred twenty-eight".