406789 has 2 divisors, whose sum is σ = 406790. Its totient is φ = 406788.

The previous prime is 406739. The next prime is 406807. The reversal of 406789 is 987604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260100 + 146689 = 510^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 406789 - 2⁷ = 406661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203394 + 203395.

It is an arithmetic number, because the mean of its divisors is an integer number (203395).

2⁴⁰⁶⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

406789 is a deficient number, since it is larger than the sum of its proper divisors (1).

406789 is an equidigital number, since it uses as much as digits as its factorization.

406789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 406789 is about 637.8001254312. The cubic root of 406789 is about 74.0951418068.

The spelling of 406789 in words is "four hundred six thousand, seven hundred eighty-nine".