405821235680 has 96 divisors (see below), whose sum is σ = 1095879020544. Its totient is φ = 139118178816.

The previous prime is 405821235653. The next prime is 405821235689. The reversal of 405821235680 is 86532128504.

It is a Cunningham number, because it is equal to 637041²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405821235689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8895809 + ... + 8941311.

It is an arithmetic number, because the mean of its divisors is an integer number (11415406464).

Almost surely, 2^405821235680 is an apocalyptic number.

405821235680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405821235680 is an abundant number, since it is smaller than the sum of its proper divisors (690057784864).

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

405821235680 is a wasteful number, since it uses less digits than its factorization.

405821235680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53488 (or 53480 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 405821235680 in words is "four hundred five billion, eight hundred twenty-one million, two hundred thirty-five thousand, six hundred eighty".