405888967989 has 12 divisors (see below), whose sum is σ = 590563512396. Its totient is φ = 268617515712.

The previous prime is 405888967973. The next prime is 405888968029. The reversal of 405888967989 is 989769888504.

It can be written as a sum of positive squares in 2 ways, for example, as 199621304100 + 206267663889 = 446790^2 + 454167^2 .

It is not a de Polignac number, because 405888967989 - 2⁴ = 405888967973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405888967969) 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 11 ways as a sum of consecutive naturals, for example, 164592834 + ... + 164595299.

It is an arithmetic number, because the mean of its divisors is an integer number (49213626033).

Almost surely, 2^405888967989 is an apocalyptic number.

It is an amenable number.

405888967989 is a deficient number, since it is larger than the sum of its proper divisors (184674544407).

405888967989 is a wasteful number, since it uses less digits than its factorization.

405888967989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329188276 (or 329188273 counting only the distinct ones).

The product of its (nonzero) digits is 2508226560, while the sum is 81.

The spelling of 405888967989 in words is "four hundred five billion, eight hundred eighty-eight million, nine hundred sixty-seven thousand, nine hundred eighty-nine".