39377720978 has 6 divisors (see below), whose sum is σ = 59067002421. Its totient is φ = 19688720172.

The previous prime is 39377720971. The next prime is 39377720999. The reversal of 39377720978 is 87902777393.

It can be written as a sum of positive squares in 2 ways, for example, as 24069350449 + 15308370529 = 155143^2 + 123727^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=140317.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39377720978.

It is not an unprimeable number, because it can be changed into a prime (39377720971) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 210476 + ... + 350792.

Almost surely, 2^39377720978 is an apocalyptic number.

39377720978 is a deficient number, since it is larger than the sum of its proper divisors (19689281443).

39377720978 is an frugal number, since it uses more digits than its factorization.

39377720978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280636 (or 140319 counting only the distinct ones).

The product of its (nonzero) digits is 28005264, while the sum is 62.

The spelling of 39377720978 in words is "thirty-nine billion, three hundred seventy-seven million, seven hundred twenty thousand, nine hundred seventy-eight".