11781240 has 64 divisors (see below), whose sum is σ = 36495360. Its totient is φ = 3039360.

The previous prime is 11781233. The next prime is 11781241. The reversal of 11781240 is 4218711.

11781240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 11781240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2137 + ... + 5303.

It is an arithmetic number, because the mean of its divisors is an integer number (570240).

Almost surely, 2^11781240 is an apocalyptic number.

11781240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11781240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18247680).

11781240 is an abundant number, since it is smaller than the sum of its proper divisors (24714120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11781240 is a wasteful number, since it uses less digits than its factorization.

11781240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212 (or 3208 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 11781240 is about 3432.3810977221. The cubic root of 11781240 is about 227.5430985449.

Adding to 11781240 its reverse (4218711), we get a palindrome (15999951).

It can be divided in two parts, 11781 and 240, that added together give a palindrome (12021).

The spelling of 11781240 in words is "eleven million, seven hundred eighty-one thousand, two hundred forty".