11813939 has 2 divisors, whose sum is σ = 11813940. Its totient is φ = 11813938.

The previous prime is 11813917. The next prime is 11813947. The reversal of 11813939 is 93931811.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11813939 is a prime.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 11813899 and 11813908.

It is not a weakly prime, because it can be changed into another prime (11813969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5906969 + 5906970.

It is an arithmetic number, because the mean of its divisors is an integer number (5906970).

Almost surely, 2^11813939 is an apocalyptic number.

11813939 is a deficient number, since it is larger than the sum of its proper divisors (1).

11813939 is an equidigital number, since it uses as much as digits as its factorization.

11813939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 11813939 is about 3437.1411085377. The cubic root of 11813939 is about 227.7534204549.

The spelling of 11813939 in words is "eleven million, eight hundred thirteen thousand, nine hundred thirty-nine".