12011540 has 12 divisors (see below), whose sum is σ = 25224276. Its totient is φ = 4804608.

The previous prime is 12011513. The next prime is 12011557. The reversal of 12011540 is 4511021.

It can be written as a sum of positive squares in 2 ways, for example, as 8317456 + 3694084 = 2884^2 + 1922^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300269 + ... + 300308.

It is an arithmetic number, because the mean of its divisors is an integer number (2102023).

Almost surely, 2^12011540 is an apocalyptic number.

12011540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12011540 is an abundant number, since it is smaller than the sum of its proper divisors (13212736).

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

12011540 is a wasteful number, since it uses less digits than its factorization.

12011540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600586 (or 600584 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 12011540 is about 3465.7668704055. The cubic root of 12011540 is about 229.0162139000.

Adding to 12011540 its reverse (4511021), we get a palindrome (16522561).

The spelling of 12011540 in words is "twelve million, eleven thousand, five hundred forty".