4000181 has 8 divisors (see below), whose sum is σ = 4167384. Its totient is φ = 3836160.

The previous prime is 4000169. The next prime is 4000189. The reversal of 4000181 is 1810004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1343281 + 2656900 = 1159^2 + 1630^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-4000181 is a prime.

It is a super-2 number, since 2×4000181² = 32002896065522, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1961 + ... + 3441.

It is an arithmetic number, because the mean of its divisors is an integer number (520923).

Almost surely, 2^4000181 is an apocalyptic number.

It is an amenable number.

4000181 is a deficient number, since it is larger than the sum of its proper divisors (167203).

4000181 is a wasteful number, since it uses less digits than its factorization.

4000181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 4000181 is about 2000.0452494881. The cubic root of 4000181 is about 158.7424994906.

Adding to 4000181 its reverse (1810004), we get a palindrome (5810185).

The spelling of 4000181 in words is "four million, one hundred eighty-one", and thus it is an aban number.