406865 has 4 divisors (see below), whose sum is σ = 488244. Its totient is φ = 325488.

The previous prime is 406859. The next prime is 406873. The reversal of 406865 is 568604.

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 271441 + 135424 = 521^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 406865 - 2¹² = 402769 is a prime.

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 406865.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40682 + ... + 40691.

It is an arithmetic number, because the mean of its divisors is an integer number (122061).

2⁴⁰⁶⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

406865 is a deficient number, since it is larger than the sum of its proper divisors (81379).

406865 is an equidigital number, since it uses as much as digits as its factorization.

406865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81378.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 406865 is about 637.8597024425. The cubic root of 406865 is about 74.0997558943.

The spelling of 406865 in words is "four hundred six thousand, eight hundred sixty-five".