12271520 has 24 divisors (see below), whose sum is σ = 28991844. Its totient is φ = 4908544.

The previous prime is 12271517. The next prime is 12271537. The reversal of 12271520 is 2517221.

It can be written as a sum of positive squares in 2 ways, for example, as 11916304 + 355216 = 3452^2 + 596^2 .

It is a super-2 number, since 2×12271520² = 301180406220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12271492 and 12271501.

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, 38189 + ... + 38508.

Almost surely, 2^12271520 is an apocalyptic number.

12271520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12271520 is an abundant number, since it is smaller than the sum of its proper divisors (16720324).

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

12271520 is an equidigital number, since it uses as much as digits as its factorization.

12271520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76712 (or 76704 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 12271520 is about 3503.0729367228. The cubic root of 12271520 is about 230.6567241901.

Adding to 12271520 its reverse (2517221), we get a palindrome (14788741).

The spelling of 12271520 in words is "twelve million, two hundred seventy-one thousand, five hundred twenty".