4392181 has 2 divisors, whose sum is σ = 4392182. Its totient is φ = 4392180.

The previous prime is 4392169. The next prime is 4392203. The reversal of 4392181 is 1812934.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4137156 + 255025 = 2034^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 4392181 - 2¹⁷ = 4261109 is a prime.

It is a super-2 number, since 2×4392181² = 38582507873522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4392151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2196090 + 2196091.

It is an arithmetic number, because the mean of its divisors is an integer number (2196091).

Almost surely, 2^4392181 is an apocalyptic number.

It is an amenable number.

4392181 is a deficient number, since it is larger than the sum of its proper divisors (1).

4392181 is an equidigital number, since it uses as much as digits as its factorization.

4392181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 4392181 is about 2095.7530866016. The cubic root of 4392181 is about 163.7671318245.

The spelling of 4392181 in words is "four million, three hundred ninety-two thousand, one hundred eighty-one".