2543415638 has 4 divisors (see below), whose sum is σ = 3815123460. Its totient is φ = 1271707818.

The previous prime is 2543415629. The next prime is 2543415649. The reversal of 2543415638 is 8365143452.

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

It is a junction number, because it is equal to n+sod(n) for n = 2543415595 and 2543415604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635853908 + ... + 635853911.

It is an arithmetic number, because the mean of its divisors is an integer number (953780865).

Almost surely, 2^2543415638 is an apocalyptic number.

2543415638 is a deficient number, since it is larger than the sum of its proper divisors (1271707822).

2543415638 is a wasteful number, since it uses less digits than its factorization.

2543415638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271707821.

The product of its digits is 345600, while the sum is 41.

The square root of 2543415638 is about 50432.2876538433. The cubic root of 2543415638 is about 1365.0203073186.

The spelling of 2543415638 in words is "two billion, five hundred forty-three million, four hundred fifteen thousand, six hundred thirty-eight".