240405621543 has 32 divisors (see below), whose sum is σ = 362064326400. Its totient is φ = 157612888800.

The previous prime is 240405621539. The next prime is 240405621593. The reversal of 240405621543 is 345126504042.

240405621543 is a `hidden beast` number, since 2 + 4 + 0 + 40 + 56 + 21 + 543 = 666.

It is not a de Polignac number, because 240405621543 - 2² = 240405621539 is a prime.

It is a super-2 number, since 2×240405621543² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 240405621498 and 240405621507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240405621523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11470768 + ... + 11491706.

It is an arithmetic number, because the mean of its divisors is an integer number (11314510200).

Almost surely, 2^240405621543 is an apocalyptic number.

240405621543 is a deficient number, since it is larger than the sum of its proper divisors (121658704857).

240405621543 is a wasteful number, since it uses less digits than its factorization.

240405621543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27980 (or 27974 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 240405621543 in words is "two hundred forty billion, four hundred five million, six hundred twenty-one thousand, five hundred forty-three".