12420637 has 4 divisors (see below), whose sum is σ = 12624316. Its totient is φ = 12216960.

The previous prime is 12420619. The next prime is 12420649. The reversal of 12420637 is 73602421.

12420637 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73602421 = 41 ⋅1795181.

It can be written as a sum of positive squares in 2 ways, for example, as 2013561 + 10407076 = 1419^2 + 3226^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420637 - 2²³ = 4032029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420607) 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, 101748 + ... + 101869.

It is an arithmetic number, because the mean of its divisors is an integer number (3156079).

Almost surely, 2^12420637 is an apocalyptic number.

It is an amenable number.

12420637 is a deficient number, since it is larger than the sum of its proper divisors (203679).

12420637 is an equidigital number, since it uses as much as digits as its factorization.

12420637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203678.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 12420637 is about 3524.2924112508. The cubic root of 12420637 is about 231.5872379798.

The spelling of 12420637 in words is "twelve million, four hundred twenty thousand, six hundred thirty-seven".