12271620 has 96 divisors (see below), whose sum is σ = 37231488. Its totient is φ = 3008512.

The previous prime is 12271613. The next prime is 12271621. The reversal of 12271620 is 2617221.

It is not an unprimeable number, because it can be changed into a prime (12271621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53947 + ... + 54173.

It is an arithmetic number, because the mean of its divisors is an integer number (387828).

Almost surely, 2^12271620 is an apocalyptic number.

12271620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12271620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18615744).

12271620 is an abundant number, since it is smaller than the sum of its proper divisors (24959868).

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

12271620 is a wasteful number, since it uses less digits than its factorization.

12271620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 12271620 is about 3503.0872098765. The cubic root of 12271620 is about 230.6573507251.

Adding to 12271620 its reverse (2617221), we get a palindrome (14888841).

The spelling of 12271620 in words is "twelve million, two hundred seventy-one thousand, six hundred twenty".