405320813240 has 64 divisors (see below), whose sum is σ = 1042315819200. Its totient is φ = 138958829568.

The previous prime is 405320813231. The next prime is 405320813299. The reversal of 405320813240 is 42318023504.

It is a junction number, because it is equal to n+sod(n) for n = 405320813197 and 405320813206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6315392 + ... + 6379248.

It is an arithmetic number, because the mean of its divisors is an integer number (16286184675).

Almost surely, 2^405320813240 is an apocalyptic number.

405320813240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405320813240 is an abundant number, since it is smaller than the sum of its proper divisors (636995005960).

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

405320813240 is a wasteful number, since it uses less digits than its factorization.

405320813240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86544 (or 86540 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 405320813240 its reverse (42318023504), we get a palindrome (447638836744).

The spelling of 405320813240 in words is "four hundred five billion, three hundred twenty million, eight hundred thirteen thousand, two hundred forty".