39940505055 has 320 divisors, whose sum is σ = 86938790400. Its totient is φ = 17322439680.

The previous prime is 39940505029. The next prime is 39940505089. The reversal of 39940505055 is 55050504993.

39940505055 is a `hidden beast` number, since 3 + 9 + 94 + 0 + 50 + 505 + 5 = 666.

It is not a de Polignac number, because 39940505055 - 2¹⁶ = 39940439519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 39940505055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 130099212 + ... + 130099518.

It is an arithmetic number, because the mean of its divisors is an integer number (271683720).

Almost surely, 2^39940505055 is an apocalyptic number.

39940505055 is an abundant number, since it is smaller than the sum of its proper divisors (46998285345).

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

39940505055 is a wasteful number, since it uses less digits than its factorization.

39940505055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 607500, while the sum is 45.

The spelling of 39940505055 in words is "thirty-nine billion, nine hundred forty million, five hundred five thousand, fifty-five".