405785981121 has 8 divisors (see below), whose sum is σ = 541056537984. Its totient is φ = 270519705840.

The previous prime is 405785981101. The next prime is 405785981137. The reversal of 405785981121 is 121189587504.

It is a happy number.

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

It is not a de Polignac number, because 405785981121 - 2¹⁰ = 405785980097 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (405785981101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 842310 + ... + 1233311.

It is an arithmetic number, because the mean of its divisors is an integer number (67632067248).

Almost surely, 2^405785981121 is an apocalyptic number.

It is an amenable number.

405785981121 is a deficient number, since it is larger than the sum of its proper divisors (135270556863).

405785981121 is a wasteful number, since it uses less digits than its factorization.

405785981121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140791.

The product of its (nonzero) digits is 806400, while the sum is 51.

The spelling of 405785981121 in words is "four hundred five billion, seven hundred eighty-five million, nine hundred eighty-one thousand, one hundred twenty-one".