2851638 has 8 divisors (see below), whose sum is σ = 5703288. Its totient is φ = 950544.

The previous prime is 2851633. The next prime is 2851643. The reversal of 2851638 is 8361582.

It is a happy number.

2851638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2851633) and next prime (2851643).

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

2851638 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2851599 and 2851608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2851633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237631 + ... + 237642.

It is an arithmetic number, because the mean of its divisors is an integer number (712911).

2^2851638 is an apocalyptic number.

2851638 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.

2851638 is a wasteful number, since it uses less digits than its factorization.

2851638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475278.

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

The square root of 2851638 is about 1688.6793656583. The cubic root of 2851638 is about 141.8071507617.

The spelling of 2851638 in words is "two million, eight hundred fifty-one thousand, six hundred thirty-eight".