40000163978 has 8 divisors (see below), whose sum is σ = 60213770820. Its totient is φ = 19928907040.

The previous prime is 40000163947. The next prime is 40000163989. The reversal of 40000163978 is 87936100004.

It can be written as a sum of positive squares in 2 ways, for example, as 39448712689 + 551451289 = 198617^2 + 23483^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35586773 + ... + 35587896.

Almost surely, 2^40000163978 is an apocalyptic number.

40000163978 is a deficient number, since it is larger than the sum of its proper divisors (20213606842).

40000163978 is a wasteful number, since it uses less digits than its factorization.

40000163978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71174952.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 40000163978 in words is "forty billion, one hundred sixty-three thousand, nine hundred seventy-eight".