40409965981 has 12 divisors (see below), whose sum is σ = 50762933536. Its totient is φ = 31488284520.

The previous prime is 40409965979. The next prime is 40409966029. The reversal of 40409965981 is 18956990404.

It is not a de Polignac number, because 40409965981 - 2¹ = 40409965979 is a prime.

It is a super-2 number, since 2×40409965981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40409966981) 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, 23853915 + ... + 23855608.

Almost surely, 2^40409965981 is an apocalyptic number.

It is an amenable number.

40409965981 is a deficient number, since it is larger than the sum of its proper divisors (10352967555).

40409965981 is a wasteful number, since it uses less digits than its factorization.

40409965981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47709552 (or 47709541 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 40409965981 in words is "forty billion, four hundred nine million, nine hundred sixty-five thousand, nine hundred eighty-one".