11721393 has 6 divisors (see below), whose sum is σ = 16930914. Its totient is φ = 7814256.

The previous prime is 11721373. The next prime is 11721397. The reversal of 11721393 is 39312711.

It can be written as a sum of positive squares in only one way, i.e., 11614464 + 106929 = 3408^2 + 327^2 .

It is not a de Polignac number, because 11721393 - 2¹² = 11717297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11721397) 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 5 ways as a sum of consecutive naturals, for example, 651180 + ... + 651197.

It is an arithmetic number, because the mean of its divisors is an integer number (2821819).

Almost surely, 2^11721393 is an apocalyptic number.

It is an amenable number.

11721393 is a deficient number, since it is larger than the sum of its proper divisors (5209521).

11721393 is a wasteful number, since it uses less digits than its factorization.

11721393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302383 (or 1302380 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 11721393 is about 3423.6519975021. The cubic root of 11721393 is about 227.1571489083.

The spelling of 11721393 in words is "eleven million, seven hundred twenty-one thousand, three hundred ninety-three".