12918137 has 4 divisors (see below), whose sum is σ = 13363620. Its totient is φ = 12472656.

The previous prime is 12918131. The next prime is 12918149. The reversal of 12918137 is 73181921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8934121 + 3984016 = 2989^2 + 1996^2 .

It is a cyclic number.

It is not a de Polignac number, because 12918137 - 2¹⁴ = 12901753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12918131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222698 + ... + 222755.

It is an arithmetic number, because the mean of its divisors is an integer number (3340905).

Almost surely, 2^12918137 is an apocalyptic number.

It is an amenable number.

12918137 is a deficient number, since it is larger than the sum of its proper divisors (445483).

12918137 is an equidigital number, since it uses as much as digits as its factorization.

12918137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445482.

The product of its digits is 3024, while the sum is 32.

The square root of 12918137 is about 3594.1809915473. The cubic root of 12918137 is about 234.6388719214.

The spelling of 12918137 in words is "twelve million, nine hundred eighteen thousand, one hundred thirty-seven".