2857409 has 4 divisors (see below), whose sum is σ = 2878404. Its totient is φ = 2836416.

The previous prime is 2857403. The next prime is 2857417. The reversal of 2857409 is 9047582.

It is a happy number.

2857409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9047582 = 2 ⋅4523791.

It can be written as a sum of positive squares in 2 ways, for example, as 2371600 + 485809 = 1540^2 + 697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2857409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2857403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10292 + ... + 10565.

It is an arithmetic number, because the mean of its divisors is an integer number (719601).

2^2857409 is an apocalyptic number.

It is an amenable number.

2857409 is a deficient number, since it is larger than the sum of its proper divisors (20995).

2857409 is a wasteful number, since it uses less digits than its factorization.

2857409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20994.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 2857409 is about 1690.3872337426. The cubic root of 2857409 is about 141.9027470037.

The spelling of 2857409 in words is "two million, eight hundred fifty-seven thousand, four hundred nine".