3900181 has 4 divisors (see below), whose sum is σ = 4034700. Its totient is φ = 3765664.

The previous prime is 3900167. The next prime is 3900199. The reversal of 3900181 is 1810093.

3900181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1810093 = 29 ⋅62417.

It can be written as a sum of positive squares in 2 ways, for example, as 2531281 + 1368900 = 1591^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 3900181 - 2¹⁷ = 3769109 is a prime.

It is a super-2 number, since 2×3900181² = 30422823665522, 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 (3900121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67216 + ... + 67273.

It is an arithmetic number, because the mean of its divisors is an integer number (1008675).

Almost surely, 2^3900181 is an apocalyptic number.

It is an amenable number.

3900181 is a deficient number, since it is larger than the sum of its proper divisors (134519).

3900181 is a wasteful number, since it uses less digits than its factorization.

3900181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134518.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 3900181 is about 1974.8875917378. The cubic root of 3900181 is about 157.4085267112.

The spelling of 3900181 in words is "three million, nine hundred thousand, one hundred eighty-one".