12255381 has 20 divisors (see below), whose sum is σ = 18573984. Its totient is φ = 8051400.

The previous prime is 12255379. The next prime is 12255403. The reversal of 12255381 is 18355221.

It is a happy number.

12255381 is a `hidden beast` number, since 122 + 5 + 538 + 1 = 666.

It is not a de Polignac number, because 12255381 - 2¹ = 12255379 is a prime.

It is a super-2 number, since 2×12255381² = 300388726910322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12255781) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4686 + ... + 6816.

Almost surely, 2^12255381 is an apocalyptic number.

It is an amenable number.

12255381 is a deficient number, since it is larger than the sum of its proper divisors (6318603).

12255381 is an equidigital number, since it uses as much as digits as its factorization.

12255381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214 (or 2205 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 12255381 is about 3500.7686298869. The cubic root of 12255381 is about 230.5555630737. Note that the first 4 decimals are identical.

The spelling of 12255381 in words is "twelve million, two hundred fifty-five thousand, three hundred eighty-one".