2638647 has 18 divisors (see below), whose sum is σ = 4191096. Its totient is φ = 1598520.

The previous prime is 2638633. The next prime is 2638651. The reversal of 2638647 is 7468362.

2638647 is a `hidden beast` number, since 2 + 6 + 3 + 8 + 647 = 666.

It is not a de Polignac number, because 2638647 - 2⁴ = 2638631 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638607) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 123 + ... + 2300.

2^2638647 is an apocalyptic number.

2638647 is a deficient number, since it is larger than the sum of its proper divisors (1552449).

2638647 is a wasteful number, since it uses less digits than its factorization.

2638647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451 (or 2437 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 2638647 is about 1624.3912705995. The cubic root of 2638647 is about 138.1848499529.

The spelling of 2638647 in words is "two million, six hundred thirty-eight thousand, six hundred forty-seven".