405321323020 has 24 divisors (see below), whose sum is σ = 851239187568. Its totient is φ = 162116260800.

The previous prime is 405321322949. The next prime is 405321323023. The reversal of 405321323020 is 20323123504.

It is not an unprimeable number, because it can be changed into a prime (405321323023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493491 + ... + 1026730.

It is an arithmetic number, because the mean of its divisors is an integer number (35468299482).

Almost surely, 2^405321323020 is an apocalyptic number.

It is an amenable number.

405321323020 is an abundant number, since it is smaller than the sum of its proper divisors (445917864548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405321323020 is a wasteful number, since it uses less digits than its factorization.

405321323020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533561 (or 1533559 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 405321323020 its reverse (20323123504), we get a palindrome (425644446524).

The spelling of 405321323020 in words is "four hundred five billion, three hundred twenty-one million, three hundred twenty-three thousand, twenty".