12247781 has 8 divisors (see below), whose sum is σ = 15074304. Its totient is φ = 9690480.

The previous prime is 12247771. The next prime is 12247783. The reversal of 12247781 is 18774221.

It is a happy number.

12247781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12247781 - 2¹⁴ = 12231397 is a prime.

It is a super-2 number, since 2×12247781² = 300016278847922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12247783) 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, 67205 + ... + 67386.

It is an arithmetic number, because the mean of its divisors is an integer number (1884288).

Almost surely, 2^12247781 is an apocalyptic number.

It is an amenable number.

12247781 is a deficient number, since it is larger than the sum of its proper divisors (2826523).

12247781 is a wasteful number, since it uses less digits than its factorization.

12247781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134611.

The product of its digits is 6272, while the sum is 32.

The square root of 12247781 is about 3499.6829856431. The cubic root of 12247781 is about 230.5078946357.

The spelling of 12247781 in words is "twelve million, two hundred forty-seven thousand, seven hundred eighty-one".