406445 has 16 divisors (see below), whose sum is σ = 542640. Its totient is φ = 292032.

The previous prime is 406423. The next prime is 406447. The reversal of 406445 is 544604.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 218089 + 188356 = 467^2 + 434^2 .

It is not a de Polignac number, because 406445 - 2⁶ = 406381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 406445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406447) 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 15 ways as a sum of consecutive naturals, for example, 10967 + ... + 11003.

It is an arithmetic number, because the mean of its divisors is an integer number (33915).

2⁴⁰⁶⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

406445 is a deficient number, since it is larger than the sum of its proper divisors (136195).

406445 is an equidigital number, since it uses as much as digits as its factorization.

406445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 406445 is about 637.5303914324. The cubic root of 406445 is about 74.0742497990.

The spelling of 406445 in words is "four hundred six thousand, four hundred forty-five".