12371220 has 36 divisors (see below), whose sum is σ = 37526580. Its totient is φ = 3298944.

The previous prime is 12371213. The next prime is 12371221. The reversal of 12371220 is 2217321.

It can be written as a sum of positive squares in 2 ways, for example, as 6081156 + 6290064 = 2466^2 + 2508^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12371193 and 12371202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12371221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34185 + ... + 34544.

It is an arithmetic number, because the mean of its divisors is an integer number (1042405).

Almost surely, 2^12371220 is an apocalyptic number.

12371220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12371220 is an abundant number, since it is smaller than the sum of its proper divisors (25155360).

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

12371220 is a wasteful number, since it uses less digits than its factorization.

12371220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68744 (or 68739 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 12371220 is about 3517.2745130285. The cubic root of 12371220 is about 231.2796971844.

Adding to 12371220 its reverse (2217321), we get a palindrome (14588541).

The spelling of 12371220 in words is "twelve million, three hundred seventy-one thousand, two hundred twenty".