406845 has 12 divisors (see below), whose sum is σ = 705276. Its totient is φ = 216960.

The previous prime is 406837. The next prime is 406859. The reversal of 406845 is 548604.

It can be written as a sum of positive squares in 2 ways, for example, as 311364 + 95481 = 558^2 + 309^2 .

It is not a de Polignac number, because 406845 - 2³ = 406837 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 4476 + ... + 4565.

It is an arithmetic number, because the mean of its divisors is an integer number (58773).

2⁴⁰⁶⁸⁴⁵ is an apocalyptic number.

406845 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

406845 is a deficient number, since it is larger than the sum of its proper divisors (298431).

406845 is a wasteful number, since it uses less digits than its factorization.

406845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9052 (or 9049 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 406845 is about 637.8440248211. The cubic root of 406845 is about 74.0985417165.

The spelling of 406845 in words is "four hundred six thousand, eight hundred forty-five".