11531240 has 32 divisors (see below), whose sum is σ = 29652480. Its totient is φ = 3953472.

The previous prime is 11531239. The next prime is 11531249. The reversal of 11531240 is 4213511.

11531240 is nontrivially palindromic in base 11.

It is not an unprimeable number, because it can be changed into a prime (11531249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20312 + ... + 20871.

It is an arithmetic number, because the mean of its divisors is an integer number (926640).

Almost surely, 2^11531240 is an apocalyptic number.

11531240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11531240 is an abundant number, since it is smaller than the sum of its proper divisors (18121240).

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

11531240 is a wasteful number, since it uses less digits than its factorization.

11531240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41201 (or 41197 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 11531240 is about 3395.7679543809. The cubic root of 11531240 is about 225.9220761452.

Adding to 11531240 its reverse (4213511), we get a palindrome (15744751).

The spelling of 11531240 in words is "eleven million, five hundred thirty-one thousand, two hundred forty".