40681109439 has 14 divisors (see below), whose sum is σ = 60993763256. Its totient is φ = 27120739140.

The previous prime is 40681109431. The next prime is 40681109449. The reversal of 40681109439 is 93490118604.

40681109439 is a `hidden beast` number, since 40 + 68 + 110 + 9 + 439 = 666.

It is not a de Polignac number, because 40681109439 - 2³ = 40681109431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40681109394 and 40681109403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40681109431) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 27901267 + ... + 27902724.

Almost surely, 2^40681109439 is an apocalyptic number.

40681109439 is a deficient number, since it is larger than the sum of its proper divisors (20312653817).

40681109439 is an frugal number, since it uses more digits than its factorization.

40681109439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55804009 (or 55803994 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 40681109439 in words is "forty billion, six hundred eighty-one million, one hundred nine thousand, four hundred thirty-nine".