406401305 has 4 divisors (see below), whose sum is σ = 487681572. Its totient is φ = 325121040.

The previous prime is 406401277. The next prime is 406401311. The reversal of 406401305 is 503104604.

It is a happy number.

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 309654409 + 96746896 = 17597^2 + 9836^2 .

It is not a de Polignac number, because 406401305 - 2²⁰ = 405352729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40640126 + ... + 40640135.

It is an arithmetic number, because the mean of its divisors is an integer number (121920393).

Almost surely, 2^406401305 is an apocalyptic number.

It is an amenable number.

406401305 is a deficient number, since it is larger than the sum of its proper divisors (81280267).

406401305 is an equidigital number, since it uses as much as digits as its factorization.

406401305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81280266.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 406401305 is about 20159.3974364315. The cubic root of 406401305 is about 740.7159524518.

Adding to 406401305 its reverse (503104604), we get a palindrome (909505909).

The spelling of 406401305 in words is "four hundred six million, four hundred one thousand, three hundred five".