12638422 has 4 divisors (see below), whose sum is σ = 18957636. Its totient is φ = 6319210.

The previous prime is 12638419. The next prime is 12638453. The reversal of 12638422 is 22483621.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3159604 + ... + 3159607.

It is an arithmetic number, because the mean of its divisors is an integer number (4739409).

Almost surely, 2^12638422 is an apocalyptic number.

12638422 is a deficient number, since it is larger than the sum of its proper divisors (6319214).

12638422 is an equidigital number, since it uses as much as digits as its factorization.

12638422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319213.

The product of its digits is 4608, while the sum is 28.

The square root of 12638422 is about 3555.0558364110. The cubic root of 12638422 is about 232.9329628409.

The spelling of 12638422 in words is "twelve million, six hundred thirty-eight thousand, four hundred twenty-two".