2638243 has 2 divisors, whose sum is σ = 2638244. Its totient is φ = 2638242.

The previous prime is 2638231. The next prime is 2638253. The reversal of 2638243 is 3428362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2638243 is a prime.

It is a super-2 number, since 2×2638243² = 13920652254098, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2638253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319121 + 1319122.

It is an arithmetic number, because the mean of its divisors is an integer number (1319122).

2^2638243 is an apocalyptic number.

2638243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638243 is an equidigital number, since it uses as much as digits as its factorization.

2638243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

The square root of 2638243 is about 1624.2669115635. The cubic root of 2638243 is about 138.1777971554.

The spelling of 2638243 in words is "two million, six hundred thirty-eight thousand, two hundred forty-three".