11728621 has 2 divisors, whose sum is σ = 11728622. Its totient is φ = 11728620.

The previous prime is 11728601. The next prime is 11728627. The reversal of 11728621 is 12682711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9523396 + 2205225 = 3086^2 + 1485^2 .

It is a cyclic number.

It is not a de Polignac number, because 11728621 - 2¹⁷ = 11597549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11728621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11728627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5864310 + 5864311.

It is an arithmetic number, because the mean of its divisors is an integer number (5864311).

Almost surely, 2^11728621 is an apocalyptic number.

It is an amenable number.

11728621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11728621 is an equidigital number, since it uses as much as digits as its factorization.

11728621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 11728621 is about 3424.7074327598. The cubic root of 11728621 is about 227.2038314854.

The spelling of 11728621 in words is "eleven million, seven hundred twenty-eight thousand, six hundred twenty-one".