11813949 has 48 divisors (see below), whose sum is σ = 20592000. Its totient is φ = 6519744.

The previous prime is 11813947. The next prime is 11813969. The reversal of 11813949 is 94931811.

It is not a de Polignac number, because 11813949 - 2¹ = 11813947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11813947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132697 + ... + 132785.

It is an arithmetic number, because the mean of its divisors is an integer number (429000).

Almost surely, 2^11813949 is an apocalyptic number.

It is an amenable number.

11813949 is a deficient number, since it is larger than the sum of its proper divisors (8778051).

11813949 is an equidigital number, since it uses as much as digits as its factorization.

11813949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 142 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 11813949 is about 3437.1425632348. The cubic root of 11813949 is about 227.7534847161.

The spelling of 11813949 in words is "eleven million, eight hundred thirteen thousand, nine hundred forty-nine".