11781385 has 32 divisors (see below), whose sum is σ = 17915904. Its totient is φ = 7224000.

The previous prime is 11781383. The next prime is 11781389. The reversal of 11781385 is 58318711.

It is not a de Polignac number, because 11781385 - 2¹ = 11781383 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 11781385.

It is not an unprimeable number, because it can be changed into a prime (11781383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27120 + ... + 27550.

It is an arithmetic number, because the mean of its divisors is an integer number (559872).

Almost surely, 2^11781385 is an apocalyptic number.

It is an amenable number.

11781385 is a deficient number, since it is larger than the sum of its proper divisors (6134519).

11781385 is a wasteful number, since it uses less digits than its factorization.

11781385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525.

The product of its digits is 6720, while the sum is 34.

The square root of 11781385 is about 3432.4022200203. The cubic root of 11781385 is about 227.5440320520.

The spelling of 11781385 in words is "eleven million, seven hundred eighty-one thousand, three hundred eighty-five".