406786 has 4 divisors (see below), whose sum is σ = 610182. Its totient is φ = 203392.

The previous prime is 406739. The next prime is 406789. The reversal of 406786 is 687604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 378225 + 28561 = 615^2 + 169^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (406789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101695 + ... + 101698.

2⁴⁰⁶⁷⁸⁶ is an apocalyptic number.

406786 is a deficient number, since it is larger than the sum of its proper divisors (203396).

406786 is a wasteful number, since it uses less digits than its factorization.

406786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203395.

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

The square root of 406786 is about 637.7977735929. The cubic root of 406786 is about 74.0949596600.

The spelling of 406786 in words is "four hundred six thousand, seven hundred eighty-six".