12400522 has 4 divisors (see below), whose sum is σ = 18600786. Its totient is φ = 6200260.

The previous prime is 12400517. The next prime is 12400541. The reversal of 12400522 is 22500421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22500421 = 653 ⋅34457.

It can be written as a sum of positive squares in only one way, i.e., 12383361 + 17161 = 3519^2 + 131^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12400496 and 12400505.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3100129 + ... + 3100132.

Almost surely, 2^12400522 is an apocalyptic number.

12400522 is a deficient number, since it is larger than the sum of its proper divisors (6200264).

12400522 is an equidigital number, since it uses as much as digits as its factorization.

12400522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6200263.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 12400522 is about 3521.4374905711. The cubic root of 12400522 is about 231.4621532981.

Adding to 12400522 its reverse (22500421), we get a palindrome (34900943).

The spelling of 12400522 in words is "twelve million, four hundred thousand, five hundred twenty-two".