406345 has 8 divisors (see below), whose sum is σ = 491400. Its totient is φ = 322560.

The previous prime is 406339. The next prime is 406349. The reversal of 406345 is 543604.

It can be written as a sum of positive squares in 4 ways, for example, as 576 + 405769 = 24^2 + 637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 406345 - 2⁵ = 406313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (406349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681 + ... + 1129.

It is an arithmetic number, because the mean of its divisors is an integer number (61425).

2⁴⁰⁶³⁴⁵ is an apocalyptic number.

It is an amenable number.

406345 is a deficient number, since it is larger than the sum of its proper divisors (85055).

406345 is a wasteful number, since it uses less digits than its factorization.

406345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 406345 is about 637.4519589742. The cubic root of 406345 is about 74.0681743295.

Adding to 406345 its reverse (543604), we get a palindrome (949949).

The spelling of 406345 in words is "four hundred six thousand, three hundred forty-five".