11728397 has 4 divisors (see below), whose sum is σ = 11747616. Its totient is φ = 11709180.

The previous prime is 11728393. The next prime is 11728411. The reversal of 11728397 is 79382711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79382711 = 53 ⋅1497787.

It is a cyclic number.

It is not a de Polignac number, because 11728397 - 2² = 11728393 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 11728397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11728391) 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 3 ways as a sum of consecutive naturals, for example, 8663 + ... + 9924.

It is an arithmetic number, because the mean of its divisors is an integer number (2936904).

Almost surely, 2^11728397 is an apocalyptic number.

It is an amenable number.

11728397 is a deficient number, since it is larger than the sum of its proper divisors (19219).

11728397 is an equidigital number, since it uses as much as digits as its factorization.

11728397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19218.

The product of its digits is 21168, while the sum is 38.

The square root of 11728397 is about 3424.6747290801. The cubic root of 11728397 is about 227.2023850527.

The spelling of 11728397 in words is "eleven million, seven hundred twenty-eight thousand, three hundred ninety-seven".