2581998 has 8 divisors (see below), whose sum is σ = 5164008. Its totient is φ = 860664.

The previous prime is 2581991. The next prime is 2582009. The reversal of 2581998 is 8991852.

It is a happy number.

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

2581998 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581991) 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, 215161 + ... + 215172.

It is an arithmetic number, because the mean of its divisors is an integer number (645501).

2^2581998 is an apocalyptic number.

2581998 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.

2581998 is a wasteful number, since it uses less digits than its factorization.

2581998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430338.

The product of its digits is 51840, while the sum is 42.

The square root of 2581998 is about 1606.8596702886. The cubic root of 2581998 is about 137.1887925861.

The spelling of 2581998 in words is "two million, five hundred eighty-one thousand, nine hundred ninety-eight".