2638505 has 4 divisors (see below), whose sum is σ = 3166212. Its totient is φ = 2110800.

The previous prime is 2638501. The next prime is 2638529. The reversal of 2638505 is 5058362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5058362 = 2 ⋅2529181.

It can be written as a sum of positive squares in 2 ways, for example, as 2036329 + 602176 = 1427^2 + 776^2 .

It is not a de Polignac number, because 2638505 - 2² = 2638501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638501) 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, 263846 + ... + 263855.

It is an arithmetic number, because the mean of its divisors is an integer number (791553).

2^2638505 is an apocalyptic number.

It is an amenable number.

2638505 is a deficient number, since it is larger than the sum of its proper divisors (527707).

2638505 is an equidigital number, since it uses as much as digits as its factorization.

2638505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527706.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 2638505 is about 1624.3475613304. The cubic root of 2638505 is about 138.1823710814.

The spelling of 2638505 in words is "two million, six hundred thirty-eight thousand, five hundred five".