406985 has 8 divisors (see below), whose sum is σ = 509760. Its totient is φ = 311344.

The previous prime is 406981. The next prime is 406993. The reversal of 406985 is 589604.

406985 is nontrivially palindromic in base 4.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 406985 - 2² = 406981 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406985.

It is not an unprimeable number, because it can be changed into a prime (406981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1655 + ... + 1884.

It is an arithmetic number, because the mean of its divisors is an integer number (63720).

2⁴⁰⁶⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

406985 is a deficient number, since it is larger than the sum of its proper divisors (102775).

406985 is a wasteful number, since it uses less digits than its factorization.

406985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3567.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 406985 is about 637.9537600798. The cubic root of 406985 is about 74.1070401259.

The spelling of 406985 in words is "four hundred six thousand, nine hundred eighty-five".