39840128442 has 12 divisors (see below), whose sum is σ = 86320278330. Its totient is φ = 13280042808.

The previous prime is 39840128411. The next prime is 39840128453. The reversal of 39840128442 is 24482104893.

39840128442 is a `hidden beast` number, since 3 + 9 + 84 + 0 + 128 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 33701249241 + 6138879201 = 183579^2 + 78351^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106670217 + ... + 1106670252.

Almost surely, 2^39840128442 is an apocalyptic number.

39840128442 is an abundant number, since it is smaller than the sum of its proper divisors (46480149888).

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

39840128442 is a wasteful number, since it uses less digits than its factorization.

39840128442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213340477 (or 2213340474 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 39840128442 in words is "thirty-nine billion, eight hundred forty million, one hundred twenty-eight thousand, four hundred forty-two".