2857842 has 80 divisors (see below), whose sum is σ = 7318080. Its totient is φ = 826848.

The previous prime is 2857831. The next prime is 2857849. The reversal of 2857842 is 2487582.

It is a happy number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2857797 and 2857806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 48409 + ... + 48467.

It is an arithmetic number, because the mean of its divisors is an integer number (91476).

2^2857842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2857842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3659040).

2857842 is an abundant number, since it is smaller than the sum of its proper divisors (4460238).

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

2857842 is a wasteful number, since it uses less digits than its factorization.

2857842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 100 counting only the distinct ones).

The product of its digits is 35840, while the sum is 36.

The square root of 2857842 is about 1690.5153060532. The cubic root of 2857842 is about 141.9099144278.

The spelling of 2857842 in words is "two million, eight hundred fifty-seven thousand, eight hundred forty-two".