405985656244 has 18 divisors (see below), whose sum is σ = 826470800610. Its totient is φ = 173993852592.

The previous prime is 405985656229. The next prime is 405985656301. The reversal of 405985656244 is 442656589504.

It can be written as a sum of positive squares in only one way, i.e., 338505203344 + 67480452900 = 581812^2 + 259770^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1035677499 + ... + 1035677890.

Almost surely, 2^405985656244 is an apocalyptic number.

It is an amenable number.

405985656244 is an abundant number, since it is smaller than the sum of its proper divisors (420485144366).

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

405985656244 is a wasteful number, since it uses less digits than its factorization.

405985656244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2071355407 (or 2071355398 counting only the distinct ones).

The product of its (nonzero) digits is 41472000, while the sum is 58.

The spelling of 405985656244 in words is "four hundred five billion, nine hundred eighty-five million, six hundred fifty-six thousand, two hundred forty-four".