2543820 has 24 divisors (see below), whose sum is σ = 7122864. Its totient is φ = 678336.

The previous prime is 2543813. The next prime is 2543833. The reversal of 2543820 is 283452.

It is a super-3 number, since 3×2543820³ = 49383331757492904000, which contains 333 as substring.

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, 21139 + ... + 21258.

It is an arithmetic number, because the mean of its divisors is an integer number (296786).

2^2543820 is an apocalyptic number.

2543820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2543820 is an abundant number, since it is smaller than the sum of its proper divisors (4579044).

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

2543820 is a wasteful number, since it uses less digits than its factorization.

2543820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42409 (or 42407 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 2543820 is about 1594.9357353825. The cubic root of 2543820 is about 136.5092642211.

The spelling of 2543820 in words is "two million, five hundred forty-three thousand, eight hundred twenty".