12618637 has 6 divisors (see below), whose sum is σ = 12755114. Its totient is φ = 12483600.

The previous prime is 12618629. The next prime is 12618649. The reversal of 12618637 is 73681621.

It can be written as a sum of positive squares in 3 ways, for example, as 10150596 + 2468041 = 3186^2 + 1571^2 .

It is not a de Polignac number, because 12618637 - 2³ = 12618629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12618667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9583 + ... + 10819.

Almost surely, 2^12618637 is an apocalyptic number.

It is an amenable number.

12618637 is a deficient number, since it is larger than the sum of its proper divisors (136477).

12618637 is an equidigital number, since it uses as much as digits as its factorization.

12618637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439 (or 1338 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 12618637 is about 3552.2720898039. The cubic root of 12618637 is about 232.8113499365.

The spelling of 12618637 in words is "twelve million, six hundred eighteen thousand, six hundred thirty-seven".