12347381 has 4 divisors (see below), whose sum is σ = 12681132. Its totient is φ = 12013632.

The previous prime is 12347347. The next prime is 12347383. The reversal of 12347381 is 18374321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11792356 + 555025 = 3434^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 12347381 - 2⁶ = 12347317 is a prime.

It is a super-2 number, since 2×12347381² = 304915635118322, 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 (12347383) 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, 166820 + ... + 166893.

It is an arithmetic number, because the mean of its divisors is an integer number (3170283).

Almost surely, 2^12347381 is an apocalyptic number.

It is an amenable number.

12347381 is a deficient number, since it is larger than the sum of its proper divisors (333751).

12347381 is an equidigital number, since it uses as much as digits as its factorization.

12347381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333750.

The product of its digits is 4032, while the sum is 29.

The square root of 12347381 is about 3513.8840333739. The cubic root of 12347381 is about 231.1310451265.

The spelling of 12347381 in words is "twelve million, three hundred forty-seven thousand, three hundred eighty-one".