2578243 has 4 divisors (see below), whose sum is σ = 2713960. Its totient is φ = 2442528.

The previous prime is 2578217. The next prime is 2578249. The reversal of 2578243 is 3428752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2578243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2578249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67830 + ... + 67867.

It is an arithmetic number, because the mean of its divisors is an integer number (678490).

2^2578243 is an apocalyptic number.

2578243 is a deficient number, since it is larger than the sum of its proper divisors (135717).

2578243 is a wasteful number, since it uses less digits than its factorization.

2578243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135716.

The product of its digits is 13440, while the sum is 31.

The square root of 2578243 is about 1605.6908170629. The cubic root of 2578243 is about 137.1222557617.

The spelling of 2578243 in words is "two million, five hundred seventy-eight thousand, two hundred forty-three".