2543636 has 6 divisors (see below), whose sum is σ = 4451370. Its totient is φ = 1271816.

The previous prime is 2543633. The next prime is 2543641. The reversal of 2543636 is 6363452.

It can be written as a sum of positive squares in only one way, i.e., 2421136 + 122500 = 1556^2 + 350^2 .

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2543599 and 2543608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317951 + ... + 317958.

It is an arithmetic number, because the mean of its divisors is an integer number (741895).

2^2543636 is an apocalyptic number.

It is an amenable number.

2543636 is a deficient number, since it is larger than the sum of its proper divisors (1907734).

2543636 is a wasteful number, since it uses less digits than its factorization.

2543636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635913 (or 635911 counting only the distinct ones).

The product of its digits is 12960, while the sum is 29.

The square root of 2543636 is about 1594.8780517645. The cubic root of 2543636 is about 136.5059728051.

The spelling of 2543636 in words is "two million, five hundred forty-three thousand, six hundred thirty-six".