4181665 has 8 divisors (see below), whose sum is σ = 5074920. Its totient is φ = 3307392.

The previous prime is 4181657. The next prime is 4181669. The reversal of 4181665 is 5661814.

It can be written as a sum of positive squares in 4 ways, for example, as 165649 + 4016016 = 407^2 + 2004^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 4181665 - 2³ = 4181657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4181669) 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, 4254 + ... + 5143.

It is an arithmetic number, because the mean of its divisors is an integer number (634365).

Almost surely, 2^4181665 is an apocalyptic number.

It is an amenable number.

4181665 is a deficient number, since it is larger than the sum of its proper divisors (893255).

4181665 is an equidigital number, since it uses as much as digits as its factorization.

4181665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9491.

The product of its digits is 5760, while the sum is 31.

The square root of 4181665 is about 2044.9119785458. The cubic root of 4181665 is about 161.1077426521.

The spelling of 4181665 in words is "four million, one hundred eighty-one thousand, six hundred sixty-five".