405983321 has 4 divisors (see below), whose sum is σ = 414621312. Its totient is φ = 397345332.

The previous prime is 405983311. The next prime is 405983329. The reversal of 405983321 is 123389504.

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 not a de Polignac number, because 405983321 - 2¹⁴ = 405966937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405983329) 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, 4318925 + ... + 4319018.

It is an arithmetic number, because the mean of its divisors is an integer number (103655328).

Almost surely, 2^405983321 is an apocalyptic number.

It is an amenable number.

405983321 is a deficient number, since it is larger than the sum of its proper divisors (8637991).

405983321 is an equidigital number, since it uses as much as digits as its factorization.

405983321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8637990.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 405983321 is about 20149.0277929234. The cubic root of 405983321 is about 740.4619230664.

The spelling of 405983321 in words is "four hundred five million, nine hundred eighty-three thousand, three hundred twenty-one".