12261520 has 20 divisors (see below), whose sum is σ = 28508220. Its totient is φ = 4904576.

The previous prime is 12261503. The next prime is 12261521. The reversal of 12261520 is 2516221.

It can be written as a sum of positive squares in 2 ways, for example, as 1607824 + 10653696 = 1268^2 + 3264^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (12261521) 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, 76555 + ... + 76714.

It is an arithmetic number, because the mean of its divisors is an integer number (1425411).

Almost surely, 2^12261520 is an apocalyptic number.

12261520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12261520 is an abundant number, since it is smaller than the sum of its proper divisors (16246700).

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

12261520 is a wasteful number, since it uses less digits than its factorization.

12261520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153282 (or 153276 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 12261520 is about 3501.6453275567. The cubic root of 12261520 is about 230.5940534951.

Adding to 12261520 its reverse (2516221), we get a palindrome (14777741).

The spelling of 12261520 in words is "twelve million, two hundred sixty-one thousand, five hundred twenty".