12511422 has 160 divisors (see below), whose sum is σ = 37635840. Its totient is φ = 3006720.

The previous prime is 12511399. The next prime is 12511453. The reversal of 12511422 is 22411521.

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 = 12511395 and 12511404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 212029 + ... + 212087.

It is an arithmetic number, because the mean of its divisors is an integer number (235224).

Almost surely, 2^12511422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12511422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18817920).

12511422 is an abundant number, since it is smaller than the sum of its proper divisors (25124418).

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

12511422 is a wasteful number, since it uses less digits than its factorization.

12511422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 99 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 12511422 is about 3537.1488518297. The cubic root of 12511422 is about 232.1501084644.

Adding to 12511422 its reverse (22411521), we get a palindrome (34922943).

Subtracting 12511422 from its reverse (22411521), we obtain a palindrome (9900099).

The spelling of 12511422 in words is "twelve million, five hundred eleven thousand, four hundred twenty-two".