12636440 has 32 divisors (see below), whose sum is σ = 30106080. Its totient is φ = 4756992.

The previous prime is 12636397. The next prime is 12636461. The reversal of 12636440 is 4463621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8612 + ... + 9971.

It is an arithmetic number, because the mean of its divisors is an integer number (940815).

Almost surely, 2^12636440 is an apocalyptic number.

12636440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12636440 is an abundant number, since it is smaller than the sum of its proper divisors (17469640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12636440 is a wasteful number, since it uses less digits than its factorization.

12636440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18611 (or 18607 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 12636440 is about 3554.7770675529. Note that the first 3 decimals coincide. The cubic root of 12636440 is about 232.9207857598.

The spelling of 12636440 in words is "twelve million, six hundred thirty-six thousand, four hundred forty".