11721375 has 64 divisors (see below), whose sum is σ = 22763520. Its totient is φ = 5940000.

The previous prime is 11721373. The next prime is 11721397. The reversal of 11721375 is 57312711.

It is a happy number.

It is not a de Polignac number, because 11721375 - 2¹ = 11721373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721371) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77550 + ... + 77700.

It is an arithmetic number, because the mean of its divisors is an integer number (355680).

Almost surely, 2^11721375 is an apocalyptic number.

11721375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11721375 is a deficient number, since it is larger than the sum of its proper divisors (11042145).

11721375 is a wasteful number, since it uses less digits than its factorization.

11721375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 182 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 11721375 is about 3423.6493687292. The cubic root of 11721375 is about 227.1570326300.

It can be divided in two parts, 1172137 and 5, that multiplied together give a palindrome (5860685).

The spelling of 11721375 in words is "eleven million, seven hundred twenty-one thousand, three hundred seventy-five".