405023320240 has 80 divisors (see below), whose sum is σ = 1174041642240. Its totient is φ = 126241032960.

The previous prime is 405023320217. The next prime is 405023320309. The reversal of 405023320240 is 42023320504.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32869110 + ... + 32881429.

It is an arithmetic number, because the mean of its divisors is an integer number (14675520528).

Almost surely, 2^405023320240 is an apocalyptic number.

405023320240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405023320240 is an abundant number, since it is smaller than the sum of its proper divisors (769018322000).

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

405023320240 is a wasteful number, since it uses less digits than its factorization.

405023320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65750570 (or 65750564 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 25.

Adding to 405023320240 its reverse (42023320504), we get a palindrome (447046640744).

The spelling of 405023320240 in words is "four hundred five billion, twenty-three million, three hundred twenty thousand, two hundred forty".