12840122 has 4 divisors (see below), whose sum is σ = 19260186. Its totient is φ = 6420060.

The previous prime is 12840109. The next prime is 12840131. The reversal of 12840122 is 22104821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8755681 + 4084441 = 2959^2 + 2021^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12840094 and 12840103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210029 + ... + 3210032.

Almost surely, 2^12840122 is an apocalyptic number.

12840122 is a deficient number, since it is larger than the sum of its proper divisors (6420064).

12840122 is an equidigital number, since it uses as much as digits as its factorization.

12840122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6420063.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 12840122 is about 3583.3115968333. The cubic root of 12840122 is about 234.1655754618.

Adding to 12840122 its reverse (22104821), we get a palindrome (34944943).

The spelling of 12840122 in words is "twelve million, eight hundred forty thousand, one hundred twenty-two".