406800521 has 4 divisors (see below), whose sum is σ = 413469444. Its totient is φ = 400131600.

The previous prime is 406800421. The next prime is 406800547. The reversal of 406800521 is 125008604.

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 5359225 + 401441296 = 2315^2 + 20036^2 .

It is a cyclic number.

It is not a de Polignac number, because 406800521 - 2¹⁴ = 406784137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406800551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3334370 + ... + 3334491.

It is an arithmetic number, because the mean of its divisors is an integer number (103367361).

Almost surely, 2^406800521 is an apocalyptic number.

It is an amenable number.

406800521 is a deficient number, since it is larger than the sum of its proper divisors (6668923).

406800521 is an equidigital number, since it uses as much as digits as its factorization.

406800521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6668922.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 406800521 is about 20169.2964924412. The cubic root of 406800521 is about 740.9584130304.

The spelling of 406800521 in words is "four hundred six million, eight hundred thousand, five hundred twenty-one".