11721442 has 16 divisors (see below), whose sum is σ = 18624960. Its totient is φ = 5517072.

The previous prime is 11721431. The next prime is 11721443. The reversal of 11721442 is 24412711.

It is not an unprimeable number, because it can be changed into a prime (11721443) 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 7 ways as a sum of consecutive naturals, for example, 5683 + ... + 7465.

It is an arithmetic number, because the mean of its divisors is an integer number (1164060).

Almost surely, 2^11721442 is an apocalyptic number.

11721442 is a deficient number, since it is larger than the sum of its proper divisors (6903518).

11721442 is a wasteful number, since it uses less digits than its factorization.

11721442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977.

The product of its digits is 448, while the sum is 22.

The square root of 11721442 is about 3423.6591535958. The cubic root of 11721442 is about 227.1574654431.

The spelling of 11721442 in words is "eleven million, seven hundred twenty-one thousand, four hundred forty-two".