12451220 has 12 divisors (see below), whose sum is σ = 26147604. Its totient is φ = 4980480.

The previous prime is 12451217. The next prime is 12451223. The reversal of 12451220 is 2215421.

It is an interprime number because it is at equal distance from previous prime (12451217) and next prime (12451223).

It can be written as a sum of positive squares in 2 ways, for example, as 8305924 + 4145296 = 2882^2 + 2036^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12451223) 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, 311261 + ... + 311300.

It is an arithmetic number, because the mean of its divisors is an integer number (2178967).

Almost surely, 2^12451220 is an apocalyptic number.

12451220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12451220 is an abundant number, since it is smaller than the sum of its proper divisors (13696384).

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

12451220 is a wasteful number, since it uses less digits than its factorization.

12451220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622570 (or 622568 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 12451220 is about 3528.6286288018. The cubic root of 12451220 is about 231.7771591922. Note that the first 3 decimals are identical.

Adding to 12451220 its reverse (2215421), we get a palindrome (14666641).

The spelling of 12451220 in words is "twelve million, four hundred fifty-one thousand, two hundred twenty".