12355640 has 32 divisors (see below), whose sum is σ = 30328560. Its totient is φ = 4492800.

The previous prime is 12355631. The next prime is 12355649. The reversal of 12355640 is 4655321.

It is an interprime number because it is at equal distance from previous prime (12355631) and next prime (12355649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12355649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13601 + ... + 14480.

Almost surely, 2^12355640 is an apocalyptic number.

12355640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12355640 is an abundant number, since it is smaller than the sum of its proper divisors (17972920).

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

12355640 is a wasteful number, since it uses less digits than its factorization.

12355640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28103 (or 28099 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 12355640 is about 3515.0590322212. The cubic root of 12355640 is about 231.1825671414.

The spelling of 12355640 in words is "twelve million, three hundred fifty-five thousand, six hundred forty".