406281 has 4 divisors (see below), whose sum is σ = 541712. Its totient is φ = 270852.

The previous prime is 406271. The next prime is 406309. The reversal of 406281 is 182604.

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 not a de Polignac number, because 406281 - 2¹⁴ = 389897 is a prime.

It is a super-2 number, since 2×406281² = 330128501922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406281.

It is not an unprimeable number, because it can be changed into a prime (406271) 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, 67711 + ... + 67716.

It is an arithmetic number, because the mean of its divisors is an integer number (135428).

2⁴⁰⁶²⁸¹ is an apocalyptic number.

It is an amenable number.

406281 is a deficient number, since it is larger than the sum of its proper divisors (135431).

406281 is a wasteful number, since it uses less digits than its factorization.

406281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135430.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 406281 is about 637.4017571360. The cubic root of 406281 is about 74.0642855059.

Adding to 406281 its reverse (182604), we get a palindrome (588885).

The spelling of 406281 in words is "four hundred six thousand, two hundred eighty-one".