406001 has 4 divisors (see below), whose sum is σ = 417012. Its totient is φ = 394992.

The previous prime is 405997. The next prime is 406013. The reversal of 406001 is 100604.

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 303601 + 102400 = 551^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 406001 - 2² = 405997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406501) 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, 5450 + ... + 5523.

It is an arithmetic number, because the mean of its divisors is an integer number (104253).

2⁴⁰⁶⁰⁰¹ is an apocalyptic number.

It is an amenable number.

406001 is a deficient number, since it is larger than the sum of its proper divisors (11011).

406001 is a wasteful number, since it uses less digits than its factorization.

406001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11010.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 406001 is about 637.1820775885. The cubic root of 406001 is about 74.0472670993.

Adding to 406001 its reverse (100604), we get a palindrome (506605).

The spelling of 406001 in words is "four hundred six thousand, one".