11971944 has 48 divisors (see below), whose sum is σ = 34334820. Its totient is φ = 3755520.

The previous prime is 11971943. The next prime is 11971987. The reversal of 11971944 is 44917911.

It can be written as a sum of positive squares in 2 ways, for example, as 11819844 + 152100 = 3438^2 + 390^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 11971899 and 11971908.

It is not an unprimeable number, because it can be changed into a prime (11971943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3667 + ... + 6114.

Almost surely, 2^11971944 is an apocalyptic number.

It is an amenable number.

11971944 is an abundant number, since it is smaller than the sum of its proper divisors (22362876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11971944 is a wasteful number, since it uses less digits than its factorization.

11971944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9810 (or 9803 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 11971944 is about 3460.0497106256. The cubic root of 11971944 is about 228.7642864857.

The spelling of 11971944 in words is "eleven million, nine hundred seventy-one thousand, nine hundred forty-four".