406509673 has 4 divisors (see below), whose sum is σ = 413173828. Its totient is φ = 399845520.

The previous prime is 406509643. The next prime is 406509679. The reversal of 406509673 is 376905604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 161493264 + 245016409 = 12708^2 + 15653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406509673 is a prime.

It is a super-2 number, since 2×406509673² = 330500228485133858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406509679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3331986 + ... + 3332107.

It is an arithmetic number, because the mean of its divisors is an integer number (103293457).

Almost surely, 2^406509673 is an apocalyptic number.

It is an amenable number.

406509673 is a deficient number, since it is larger than the sum of its proper divisors (6664155).

406509673 is an equidigital number, since it uses as much as digits as its factorization.

406509673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664154.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 406509673 is about 20162.0850360274. The cubic root of 406509673 is about 740.7817845671.

The spelling of 406509673 in words is "four hundred six million, five hundred nine thousand, six hundred seventy-three".