12636842 has 4 divisors (see below), whose sum is σ = 18955266. Its totient is φ = 6318420.

The previous prime is 12636823. The next prime is 12636847. The reversal of 12636842 is 24863621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24863621 = 23 ⋅1081027.

It can be written as a sum of positive squares in only one way, i.e., 12313081 + 323761 = 3509^2 + 569^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12636799 and 12636808.

It is not an unprimeable number, because it can be changed into a prime (12636847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3159209 + ... + 3159212.

Almost surely, 2^12636842 is an apocalyptic number.

12636842 is a deficient number, since it is larger than the sum of its proper divisors (6318424).

12636842 is an equidigital number, since it uses as much as digits as its factorization.

12636842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6318423.

The product of its digits is 13824, while the sum is 32.

The square root of 12636842 is about 3554.8336107334. The cubic root of 12636842 is about 232.9232556844.

The spelling of 12636842 in words is "twelve million, six hundred thirty-six thousand, eight hundred forty-two".