11638643 has 2 divisors, whose sum is σ = 11638644. Its totient is φ = 11638642.

The previous prime is 11638639. The next prime is 11638651. The reversal of 11638643 is 34683611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11638643 - 2² = 11638639 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11638603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5819321 + 5819322.

It is an arithmetic number, because the mean of its divisors is an integer number (5819322).

Almost surely, 2^11638643 is an apocalyptic number.

11638643 is a deficient number, since it is larger than the sum of its proper divisors (1).

11638643 is an equidigital number, since it uses as much as digits as its factorization.

11638643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 11638643 is about 3411.5455441779. The cubic root of 11638643 is about 226.6213291195.

The spelling of 11638643 in words is "eleven million, six hundred thirty-eight thousand, six hundred forty-three".