12323781 has 6 divisors (see below), whose sum is σ = 17801030. Its totient is φ = 8215848.

The previous prime is 12323777. The next prime is 12323783. The reversal of 12323781 is 18732321.

12323781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 933156 = 3375^2 + 966^2 .

It is not a de Polignac number, because 12323781 - 2² = 12323777 is a prime.

It is a super-2 number, since 2×12323781² = 303751156271922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12323783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 684646 + ... + 684663.

Almost surely, 2^12323781 is an apocalyptic number.

It is an amenable number.

12323781 is a deficient number, since it is larger than the sum of its proper divisors (5477249).

12323781 is a wasteful number, since it uses less digits than its factorization.

12323781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369315 (or 1369312 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 12323781 is about 3510.5243198132. The cubic root of 12323781 is about 230.9836948068.

The spelling of 12323781 in words is "twelve million, three hundred twenty-three thousand, seven hundred eighty-one".