12405522 has 8 divisors (see below), whose sum is σ = 24811056. Its totient is φ = 4135172.

The previous prime is 12405521. The next prime is 12405539. The reversal of 12405522 is 22550421.

It is a happy number.

12405522 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

12405522 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (12405521) 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, 1033788 + ... + 1033799.

It is an arithmetic number, because the mean of its divisors is an integer number (3101382).

Almost surely, 2^12405522 is an apocalyptic number.

12405522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12405522 is a wasteful number, since it uses less digits than its factorization.

12405522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067592.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 12405522 is about 3522.1473563722. The cubic root of 12405522 is about 231.4932583128.

Adding to 12405522 its reverse (22550421), we get a palindrome (34955943).

The spelling of 12405522 in words is "twelve million, four hundred five thousand, five hundred twenty-two".