2551998 has 8 divisors (see below), whose sum is σ = 5104008. Its totient is φ = 850664.

The previous prime is 2551987. The next prime is 2551999. The reversal of 2551998 is 8991552.

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

2551998 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 (2551999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212661 + ... + 212672.

It is an arithmetic number, because the mean of its divisors is an integer number (638001).

2^2551998 is an apocalyptic number.

2551998 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.

2551998 is a wasteful number, since it uses less digits than its factorization.

2551998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425338.

The product of its digits is 32400, while the sum is 39.

The square root of 2551998 is about 1597.4974178383. The cubic root of 2551998 is about 136.6553933460.

The spelling of 2551998 in words is "two million, five hundred fifty-one thousand, nine hundred ninety-eight".