2561898 has 16 divisors (see below), whose sum is σ = 5211360. Its totient is φ = 839376.

The previous prime is 2561873. The next prime is 2561899. The reversal of 2561898 is 8981652.

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

It is not an unprimeable number, because it can be changed into a prime (2561899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3265 + ... + 3972.

It is an arithmetic number, because the mean of its divisors is an integer number (325710).

2^2561898 is an apocalyptic number.

2561898 is an abundant number, since it is smaller than the sum of its proper divisors (2649462).

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

2561898 is a wasteful number, since it uses less digits than its factorization.

2561898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7301.

The product of its digits is 34560, while the sum is 39.

The square root of 2561898 is about 1600.5930151041. The cubic root of 2561898 is about 136.8318750320.

The spelling of 2561898 in words is "two million, five hundred sixty-one thousand, eight hundred ninety-eight".