405475321 has 4 divisors (see below), whose sum is σ = 410608000. Its totient is φ = 400342644.

The previous prime is 405475309. The next prime is 405475327. The reversal of 405475321 is 123574504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405475321 - 2⁹ = 405474809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405475327) 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, 2566221 + ... + 2566378.

It is an arithmetic number, because the mean of its divisors is an integer number (102652000).

Almost surely, 2^405475321 is an apocalyptic number.

It is an amenable number.

405475321 is a deficient number, since it is larger than the sum of its proper divisors (5132679).

405475321 is an equidigital number, since it uses as much as digits as its factorization.

405475321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132678.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 405475321 is about 20136.4177797343. The cubic root of 405475321 is about 740.1529517052.

The spelling of 405475321 in words is "four hundred five million, four hundred seventy-five thousand, three hundred twenty-one".