12057781 has 8 divisors (see below), whose sum is σ = 12227904. Its totient is φ = 11889120.

The previous prime is 12057769. The next prime is 12057797. The reversal of 12057781 is 18775021.

It is a happy number.

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 12057781 - 2²³ = 3669173 is a prime.

It is a super-2 number, since 2×12057781² = 290780165287922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12057281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38616 + ... + 38926.

It is an arithmetic number, because the mean of its divisors is an integer number (1528488).

Almost surely, 2^12057781 is an apocalyptic number.

It is an amenable number.

12057781 is a deficient number, since it is larger than the sum of its proper divisors (170123).

12057781 is a wasteful number, since it uses less digits than its factorization.

12057781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 12057781 is about 3472.4315688002. The cubic root of 12057781 is about 229.3097199318.

The spelling of 12057781 in words is "twelve million, fifty-seven thousand, seven hundred eighty-one".