12542220 has 72 divisors (see below), whose sum is σ = 38722320. Its totient is φ = 3285120.

The previous prime is 12542191. The next prime is 12542227. The reversal of 12542220 is 2224521.

12542220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 12542193 and 12542202.

It is not an unprimeable number, because it can be changed into a prime (12542227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10030 + ... + 11210.

It is an arithmetic number, because the mean of its divisors is an integer number (537810).

Almost surely, 2^12542220 is an apocalyptic number.

12542220 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 12542220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19361160).

12542220 is an abundant number, since it is smaller than the sum of its proper divisors (26180100).

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

12542220 is a wasteful number, since it uses less digits than its factorization.

12542220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 12542220 is about 3541.4996823380. The cubic root of 12542220 is about 232.3404385605.

12542220 divided by its sum of digits (18) gives a triangular number (696790 = T₁₁₈₀).

Adding to 12542220 its reverse (2224521), we get a palindrome (14766741).

The spelling of 12542220 in words is "twelve million, five hundred forty-two thousand, two hundred twenty".