405081 has 12 divisors (see below), whose sum is σ = 607152. Its totient is φ = 269892.

The previous prime is 405073. The next prime is 405089. The reversal of 405081 is 180504.

It is an interprime number because it is at equal distance from previous prime (405073) and next prime (405089).

It is not a de Polignac number, because 405081 - 2³ = 405073 is a prime.

It is a super-2 number, since 2×405081² = 328181233122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (405089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 591 + ... + 1076.

It is an arithmetic number, because the mean of its divisors is an integer number (50596).

2⁴⁰⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

405081 is a deficient number, since it is larger than the sum of its proper divisors (202071).

405081 is an equidigital number, since it uses as much as digits as its factorization.

405081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 1670 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 405081 is about 636.4597394965. The cubic root of 405081 is about 73.9912943253.

Adding to 405081 its reverse (180504), we get a palindrome (585585).

The spelling of 405081 in words is "four hundred five thousand, eighty-one".