406651 has 12 divisors (see below), whose sum is σ = 486552. Its totient is φ = 338688.

The previous prime is 406649. The next prime is 406661. The reversal of 406651 is 156604.

It is not a de Polignac number, because 406651 - 2¹ = 406649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2011 + ... + 2203.

It is an arithmetic number, because the mean of its divisors is an integer number (40546).

2⁴⁰⁶⁶⁵¹ is an apocalyptic number.

406651 is a deficient number, since it is larger than the sum of its proper divisors (79901).

406651 is a wasteful number, since it uses less digits than its factorization.

406651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 406651 is about 637.6919318919. The cubic root of 406651 is about 74.0867621259.

Subtracting from 406651 its reverse (156604), we obtain a cube (250047 = 63³).

The spelling of 406651 in words is "four hundred six thousand, six hundred fifty-one".