405604007981 has 8 divisors (see below), whose sum is σ = 429469365240. Its totient is φ = 381739350528.

The previous prime is 405604007959. The next prime is 405604007993. The reversal of 405604007981 is 189700406504.

It can be written as a sum of positive squares in 4 ways, for example, as 242334675625 + 163269332356 = 492275^2 + 404066^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405604007981 - 2⁶ = 405604007917 is a prime.

It is a super-2 number, since 2×405604007981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405604607981) 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 7 ways as a sum of consecutive naturals, for example, 1449215 + ... + 1706291.

It is an arithmetic number, because the mean of its divisors is an integer number (53683670655).

Almost surely, 2^405604007981 is an apocalyptic number.

It is an amenable number.

405604007981 is a deficient number, since it is larger than the sum of its proper divisors (23865357259).

405604007981 is a wasteful number, since it uses less digits than its factorization.

405604007981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349903.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 405604007981 in words is "four hundred five billion, six hundred four million, seven thousand, nine hundred eighty-one".