2551638 has 8 divisors (see below), whose sum is σ = 5103288. Its totient is φ = 850544.

The previous prime is 2551607. The next prime is 2551639. The reversal of 2551638 is 8361552.

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

2551638 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 (2551639) 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, 212631 + ... + 212642.

It is an arithmetic number, because the mean of its divisors is an integer number (637911).

2^2551638 is an apocalyptic number.

2551638 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.

2551638 is a wasteful number, since it uses less digits than its factorization.

2551638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425278.

The product of its digits is 7200, while the sum is 30.

The square root of 2551638 is about 1597.3847376258. The cubic root of 2551638 is about 136.6489672366.

The spelling of 2551638 in words is "two million, five hundred fifty-one thousand, six hundred thirty-eight".