11993721 has 8 divisors (see below), whose sum is σ = 16932384. Its totient is φ = 7525440.

The previous prime is 11993719. The next prime is 11993743. The reversal of 11993721 is 12739911.

11993721 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11993721 - 2¹ = 11993719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11993521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117535 + ... + 117636.

It is an arithmetic number, because the mean of its divisors is an integer number (2116548).

Almost surely, 2^11993721 is an apocalyptic number.

It is an amenable number.

11993721 is a deficient number, since it is larger than the sum of its proper divisors (4938663).

11993721 is a wasteful number, since it uses less digits than its factorization.

11993721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235191.

The product of its digits is 3402, while the sum is 33.

The square root of 11993721 is about 3463.1952009669. The cubic root of 11993721 is about 228.9029100954.

The spelling of 11993721 in words is "eleven million, nine hundred ninety-three thousand, seven hundred twenty-one".