12865122 has 64 divisors (see below), whose sum is σ = 30205440. Its totient is φ = 4053888.

The previous prime is 12865121. The next prime is 12865123. The reversal of 12865122 is 22156821.

It is a happy number.

12865122 is a `hidden beast` number, since 1 + 2 + 8 + 651 + 2 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (12865121) and next prime (12865123).

It is a super-2 number, since 2×12865122² = 331022728149768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12865121) 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, 93838 + ... + 93974.

It is an arithmetic number, because the mean of its divisors is an integer number (471960).

Almost surely, 2^12865122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12865122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15102720).

12865122 is an abundant number, since it is smaller than the sum of its proper divisors (17340318).

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

12865122 is a wasteful number, since it uses less digits than its factorization.

12865122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 226 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 12865122 is about 3586.7982937433. The cubic root of 12865122 is about 234.3174521110.

The spelling of 12865122 in words is "twelve million, eight hundred sixty-five thousand, one hundred twenty-two".