2638906 has 12 divisors (see below), whose sum is σ = 4093146. Its totient is φ = 1275960.

The previous prime is 2638901. The next prime is 2638907. The reversal of 2638906 is 6098362.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1461681 + 1177225 = 1209^2 + 1085^2 .

It is a d-powerful number, because it can be written as 2²¹ + 6⁴ + 3¹² + 8³ + 9³ + 0 + 6⁵ .

It is not an unprimeable number, because it can be changed into a prime (2638901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1236 + ... + 2608.

2^2638906 is an apocalyptic number.

2638906 is a deficient number, since it is larger than the sum of its proper divisors (1454240).

2638906 is a wasteful number, since it uses less digits than its factorization.

2638906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 1406 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 2638906 is about 1624.4709908152. The cubic root of 2638906 is about 138.1893710459.

The spelling of 2638906 in words is "two million, six hundred thirty-eight thousand, nine hundred six".