12638518 has 8 divisors (see below), whose sum is σ = 19153512. Its totient is φ = 6254016.

The previous prime is 12638503. The next prime is 12638533. The reversal of 12638518 is 81583621.

12638518 = T₁₃₇ + T₁₃₈ + ... + T₄₂₇.

It is an interprime number because it is at equal distance from previous prime (12638503) and next prime (12638533).

It is a sphenic number, since it is the product of 3 distinct 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 in 3 ways as a sum of consecutive naturals, for example, 32380 + ... + 32767.

It is an arithmetic number, because the mean of its divisors is an integer number (2394189).

Almost surely, 2^12638518 is an apocalyptic number.

12638518 is a deficient number, since it is larger than the sum of its proper divisors (6514994).

12638518 is an equidigital number, since it uses as much as digits as its factorization.

12638518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65246.

The product of its digits is 11520, while the sum is 34.

The square root of 12638518 is about 3555.0693382830. The cubic root of 12638518 is about 232.9335526167.

The spelling of 12638518 in words is "twelve million, six hundred thirty-eight thousand, five hundred eighteen".