39878139888972 has 192 divisors, whose sum is σ = 129235599360000. Its totient is φ = 10330913309760.

The previous prime is 39878139888893. The next prime is 39878139888973. The reversal of 39878139888972 is 27988893187893.

39878139888972 is a `hidden beast` number, since 3 + 9 + 8 + 78 + 1 + 398 + 8 + 89 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (39878139888973) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3075222 + ... + 9445277.

It is an arithmetic number, because the mean of its divisors is an integer number (673102080000).

Almost surely, 2^{39878139888972} is an apocalyptic number.

It is an amenable number.

39878139888972 is an abundant number, since it is smaller than the sum of its proper divisors (89357459471028).

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

39878139888972 is a wasteful number, since it uses less digits than its factorization.

39878139888972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12520913 (or 12520905 counting only the distinct ones).

The product of its digits is 21069103104, while the sum is 90.

The spelling of 39878139888972 in words is "thirty-nine trillion, eight hundred seventy-eight billion, one hundred thirty-nine million, eight hundred eighty-eight thousand, nine hundred seventy-two".