11952721 has 4 divisors (see below), whose sum is σ = 13039344. Its totient is φ = 10866100.

The previous prime is 11952713. The next prime is 11952737. The reversal of 11952721 is 12725911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11952721 - 2³ = 11952713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11952721.

It is not an unprimeable number, because it can be changed into a prime (11952761) 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 3 ways as a sum of consecutive naturals, for example, 543295 + ... + 543316.

It is an arithmetic number, because the mean of its divisors is an integer number (3259836).

Almost surely, 2^11952721 is an apocalyptic number.

11952721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11952721 is a deficient number, since it is larger than the sum of its proper divisors (1086623).

11952721 is a wasteful number, since it uses less digits than its factorization.

11952721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086622.

The product of its digits is 1260, while the sum is 28.

The square root of 11952721 is about 3457.2707443878. The cubic root of 11952721 is about 228.6417808551.

It can be divided in two parts, 1195 and 2721, that added together give a triangular number (3916 = T₈₈).

The spelling of 11952721 in words is "eleven million, nine hundred fifty-two thousand, seven hundred twenty-one".