406687 has 8 divisors (see below), whose sum is σ = 424080. Its totient is φ = 389760.

The previous prime is 406673. The next prime is 406697. The reversal of 406687 is 786604.

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 406687 - 2⁷ = 406559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406697) 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 7 ways as a sum of consecutive naturals, for example, 3543 + ... + 3655.

It is an arithmetic number, because the mean of its divisors is an integer number (53010).

2⁴⁰⁶⁶⁸⁷ is an apocalyptic number.

406687 is a deficient number, since it is larger than the sum of its proper divisors (17393).

406687 is a wasteful number, since it uses less digits than its factorization.

406687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 406687 is about 637.7201580631. The cubic root of 406687 is about 74.0889483124.

The spelling of 406687 in words is "four hundred six thousand, six hundred eighty-seven".