11539540 has 12 divisors (see below), whose sum is σ = 24233076. Its totient is φ = 4615808.

The previous prime is 11539529. The next prime is 11539547. The reversal of 11539540 is 4593511.

It can be written as a sum of positive squares in 2 ways, for example, as 3888784 + 7650756 = 1972^2 + 2766^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11539499 and 11539508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11539547) 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, 288469 + ... + 288508.

It is an arithmetic number, because the mean of its divisors is an integer number (2019423).

Almost surely, 2^11539540 is an apocalyptic number.

11539540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11539540 is an abundant number, since it is smaller than the sum of its proper divisors (12693536).

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

11539540 is a wasteful number, since it uses less digits than its factorization.

11539540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576986 (or 576984 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 11539540 is about 3396.9898439648. The cubic root of 11539540 is about 225.9762681635.

The spelling of 11539540 in words is "eleven million, five hundred thirty-nine thousand, five hundred forty".