12278655 has 32 divisors (see below), whose sum is σ = 22982400. Its totient is φ = 6202656.

The previous prime is 12278647. The next prime is 12278659. The reversal of 12278655 is 55687221.

It is a happy number.

It is not a de Polignac number, because 12278655 - 2³ = 12278647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172 + ... + 4958.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^12278655 is an apocalyptic number.

12278655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12278655 is a deficient number, since it is larger than the sum of its proper divisors (10703745).

12278655 is a wasteful number, since it uses less digits than its factorization.

12278655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4820 (or 4814 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 12278655 is about 3504.0911803205. The cubic root of 12278655 is about 230.7014189215.

The spelling of 12278655 in words is "twelve million, two hundred seventy-eight thousand, six hundred fifty-five".