2638885 has 8 divisors (see below), whose sum is σ = 3199896. Its totient is φ = 2088960.

The previous prime is 2638879. The next prime is 2638897. The reversal of 2638885 is 5888362.

It can be written as a sum of positive squares in 4 ways, for example, as 427716 + 2211169 = 654^2 + 1487^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-2638885 is a prime.

It is a Duffinian number.

2638885 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2236 + ... + 3205.

It is an arithmetic number, because the mean of its divisors is an integer number (399987).

2^2638885 is an apocalyptic number.

It is an amenable number.

2638885 is a deficient number, since it is larger than the sum of its proper divisors (561011).

2638885 is an equidigital number, since it uses as much as digits as its factorization.

2638885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5543.

The product of its digits is 92160, while the sum is 40.

The square root of 2638885 is about 1624.4645271596. The cubic root of 2638885 is about 138.1890044818.

The spelling of 2638885 in words is "two million, six hundred thirty-eight thousand, eight hundred eighty-five".