40438005642 has 12 divisors (see below), whose sum is σ = 87615678930. Its totient is φ = 13479335208.

The previous prime is 40438005589. The next prime is 40438005679. The reversal of 40438005642 is 24650083404.

40438005642 is a `hidden beast` number, since 4 + 0 + 4 + 3 + 8 + 0 + 0 + 5 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38698364961 + 1739640681 = 196719^2 + 41709^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40438005597 and 40438005606.

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, 1123277917 + ... + 1123277952.

Almost surely, 2^40438005642 is an apocalyptic number.

40438005642 is an abundant number, since it is smaller than the sum of its proper divisors (47177673288).

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

40438005642 is a wasteful number, since it uses less digits than its factorization.

40438005642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246555877 (or 2246555874 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 40438005642 in words is "forty billion, four hundred thirty-eight million, five thousand, six hundred forty-two".