405537587489 has 4 divisors (see below), whose sum is σ = 419521642260. Its totient is φ = 391553532720.

The previous prime is 405537587479. The next prime is 405537587513. The reversal of 405537587489 is 984785735504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 349091905600 + 56445681889 = 590840^2 + 237583^2 .

It is a cyclic number.

It is not a de Polignac number, because 405537587489 - 2⁸ = 405537587233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (405537587449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6992027342 + ... + 6992027399.

It is an arithmetic number, because the mean of its divisors is an integer number (104880410565).

Almost surely, 2^405537587489 is an apocalyptic number.

It is an amenable number.

405537587489 is a deficient number, since it is larger than the sum of its proper divisors (13984054771).

405537587489 is a wasteful number, since it uses less digits than its factorization.

405537587489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13984054770.

The product of its (nonzero) digits is 169344000, while the sum is 65.

The spelling of 405537587489 in words is "four hundred five billion, five hundred thirty-seven million, five hundred eighty-seven thousand, four hundred eighty-nine".