2638247 has 4 divisors (see below), whose sum is σ = 2793456. Its totient is φ = 2483040.

The previous prime is 2638243. The next prime is 2638253. The reversal of 2638247 is 7428362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7428362 = 2 ⋅3714181.

It is a cyclic number.

It is not a de Polignac number, because 2638247 - 2² = 2638243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638243) 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, 77579 + ... + 77612.

It is an arithmetic number, because the mean of its divisors is an integer number (698364).

2^2638247 is an apocalyptic number.

2638247 is a deficient number, since it is larger than the sum of its proper divisors (155209).

2638247 is a wasteful number, since it uses less digits than its factorization.

2638247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155208.

The product of its digits is 16128, while the sum is 32.

The square root of 2638247 is about 1624.2681428877. The cubic root of 2638247 is about 138.1778669886.

The spelling of 2638247 in words is "two million, six hundred thirty-eight thousand, two hundred forty-seven".