405545244240 has 80 divisors (see below), whose sum is σ = 1272337190208. Its totient is φ = 106842436608.

The previous prime is 405545244173. The next prime is 405545244259. The reversal of 405545244240 is 42442545504.

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

It is a congruent number.

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, 10159429 + ... + 10199268.

Almost surely, 2^405545244240 is an apocalyptic number.

405545244240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405545244240 is an abundant number, since it is smaller than the sum of its proper divisors (866791945968).

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

405545244240 is a wasteful number, since it uses less digits than its factorization.

405545244240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20358796 (or 20358790 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 39.

Adding to 405545244240 its reverse (42442545504), we get a palindrome (447987789744).

The spelling of 405545244240 in words is "four hundred five billion, five hundred forty-five million, two hundred forty-four thousand, two hundred forty".