406081 has 4 divisors (see below), whose sum is σ = 437332. Its totient is φ = 374832.

The previous prime is 406073. The next prime is 406093. The reversal of 406081 is 180604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211600 + 194481 = 460^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 406081 - 2³ = 406073 is a prime.

It is a super-2 number, since 2×406081² = 329803557122, which contains 22 as substring.

It is a Duffinian number.

406081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (406381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15606 + ... + 15631.

It is an arithmetic number, because the mean of its divisors is an integer number (109333).

2⁴⁰⁶⁰⁸¹ is an apocalyptic number.

It is an amenable number.

406081 is a deficient number, since it is larger than the sum of its proper divisors (31251).

406081 is a wasteful number, since it uses less digits than its factorization.

406081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31250.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 406081 is about 637.2448509011. The cubic root of 406081 is about 74.0521302994.

Adding to 406081 its reverse (180604), we get a palindrome (586685).

The spelling of 406081 in words is "four hundred six thousand, eighty-one".