12690638 has 8 divisors (see below), whose sum is σ = 19395288. Its totient is φ = 6225544.

The previous prime is 12690637. The next prime is 12690649. The reversal of 12690638 is 83609621.

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

It is a super-2 number, since 2×12690638² = 322104585694088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12690598 and 12690607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12690637) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 59756 + ... + 59967.

It is an arithmetic number, because the mean of its divisors is an integer number (2424411).

Almost surely, 2^12690638 is an apocalyptic number.

12690638 is a deficient number, since it is larger than the sum of its proper divisors (6704650).

12690638 is a wasteful number, since it uses less digits than its factorization.

12690638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119778.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 12690638 is about 3562.3921738068. The cubic root of 12690638 is about 233.2533117888.

The spelling of 12690638 in words is "twelve million, six hundred ninety thousand, six hundred thirty-eight".