12118381 has 4 divisors (see below), whose sum is σ = 13220064. Its totient is φ = 11016700.

The previous prime is 12118373. The next prime is 12118391. The reversal of 12118381 is 18381121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12118381 - 2³ = 12118373 is a prime.

It is a super-2 number, since 2×12118381² = 293710316122322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12118361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550825 + ... + 550846.

It is an arithmetic number, because the mean of its divisors is an integer number (3305016).

Almost surely, 2^12118381 is an apocalyptic number.

12118381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12118381 is a deficient number, since it is larger than the sum of its proper divisors (1101683).

12118381 is a wasteful number, since it uses less digits than its factorization.

12118381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101682.

The product of its digits is 384, while the sum is 25.

The square root of 12118381 is about 3481.1465065406. The cubic root of 12118381 is about 229.6932331177.

The spelling of 12118381 in words is "twelve million, one hundred eighteen thousand, three hundred eighty-one".