2561838 has 8 divisors (see below), whose sum is σ = 5123688. Its totient is φ = 853944.

The previous prime is 2561833. The next prime is 2561857. The reversal of 2561838 is 8381652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

2561838 is an admirable number.

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 = 2561799 and 2561808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561833) 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, 213481 + ... + 213492.

It is an arithmetic number, because the mean of its divisors is an integer number (640461).

2^2561838 is an apocalyptic number.

2561838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2561838 is a wasteful number, since it uses less digits than its factorization.

2561838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426978.

The product of its digits is 11520, while the sum is 33.

The square root of 2561838 is about 1600.5742719412. The cubic root of 2561838 is about 136.8308068166.

The spelling of 2561838 in words is "two million, five hundred sixty-one thousand, eight hundred thirty-eight".