12345781 has 8 divisors (see below), whose sum is σ = 14564864. Its totient is φ = 10240560.

The previous prime is 12345769. The next prime is 12345787. The reversal of 12345781 is 18754321.

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 12345781 - 2⁷ = 12345653 is a prime.

It is a super-2 number, since 2×12345781² = 304836616999922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12345787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28230 + ... + 28663.

It is an arithmetic number, because the mean of its divisors is an integer number (1820608).

Almost surely, 2^12345781 is an apocalyptic number.

It is an amenable number.

12345781 is a deficient number, since it is larger than the sum of its proper divisors (2219083).

12345781 is an equidigital number, since it uses as much as digits as its factorization.

12345781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56931.

The product of its digits is 6720, while the sum is 31.

The square root of 12345781 is about 3513.6563576992. The cubic root of 12345781 is about 231.1210612104.

The spelling of 12345781 in words is "twelve million, three hundred forty-five thousand, seven hundred eighty-one".