4004161 has 4 divisors (see below), whose sum is σ = 4576192. Its totient is φ = 3432132.

The previous prime is 4004141. The next prime is 4004179. The reversal of 4004161 is 1614004.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4004161 - 2¹¹ = 4002113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4004141) 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, 286005 + ... + 286018.

It is an arithmetic number, because the mean of its divisors is an integer number (1144048).

Almost surely, 2^4004161 is an apocalyptic number.

It is an amenable number.

4004161 is a deficient number, since it is larger than the sum of its proper divisors (572031).

4004161 is an equidigital number, since it uses as much as digits as its factorization.

4004161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572030.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 4004161 is about 2001.0399796106. The cubic root of 4004161 is about 158.7951292531.

Adding to 4004161 its reverse (1614004), we get a palindrome (5618165).

It can be divided in two parts, 400 and 4161, that multiplied together give a triangular number (1664400 = T₁₈₂₄).

The spelling of 4004161 in words is "four million, four thousand, one hundred sixty-one".