406778 has 16 divisors (see below), whose sum is σ = 656640. Its totient is φ = 188496.

The previous prime is 406739. The next prime is 406789. The reversal of 406778 is 877604.

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 7 ways as a sum of consecutive naturals, for example, 1583 + ... + 1821.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2⁴⁰⁶⁷⁷⁸ is an apocalyptic number.

406778 is a deficient number, since it is larger than the sum of its proper divisors (249862).

406778 is a wasteful number, since it uses less digits than its factorization.

406778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 406778 is about 637.7915019816. The cubic root of 406778 is about 74.0944739308.

The spelling of 406778 in words is "four hundred six thousand, seven hundred seventy-eight".