11731540 has 12 divisors (see below), whose sum is σ = 24636276. Its totient is φ = 4692608.

The previous prime is 11731537. The next prime is 11731549. The reversal of 11731540 is 4513711.

It can be written as a sum of positive squares in 2 ways, for example, as 2022084 + 9709456 = 1422^2 + 3116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11731549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293269 + ... + 293308.

It is an arithmetic number, because the mean of its divisors is an integer number (2053023).

Almost surely, 2^11731540 is an apocalyptic number.

11731540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11731540 is an abundant number, since it is smaller than the sum of its proper divisors (12904736).

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

11731540 is a wasteful number, since it uses less digits than its factorization.

11731540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586586 (or 586584 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 11731540 is about 3425.1335740377. The cubic root of 11731540 is about 227.2226786279. Note that the first 3 decimals are identical.

The spelling of 11731540 in words is "eleven million, seven hundred thirty-one thousand, five hundred forty".