405631623543420 has 96 divisors (see below), whose sum is σ = 1147215249714240. Its totient is φ = 107080602603520.

The previous prime is 405631623543409. The next prime is 405631623543427. The reversal of 405631623543420 is 24345326136504.

It is a self number, because there is not a number n which added to its sum of digits gives 405631623543420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405631623543427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30869475 + ... + 42002234.

It is an arithmetic number, because the mean of its divisors is an integer number (11950158851190).

Almost surely, 2^{405631623543420} is an apocalyptic number.

It is an amenable number.

405631623543420 is an abundant number, since it is smaller than the sum of its proper divisors (741583626170820).

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

405631623543420 is a wasteful number, since it uses less digits than its factorization.

405631623543420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72872655 (or 72872653 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 48.

Adding to 405631623543420 its reverse (24345326136504), we get a palindrome (429976949679924).

The spelling of 405631623543420 in words is "four hundred five trillion, six hundred thirty-one billion, six hundred twenty-three million, five hundred forty-three thousand, four hundred twenty".