38394129778 has 8 divisors (see below), whose sum is σ = 57924092268. Its totient is φ = 19086099024.

The previous prime is 38394129773. The next prime is 38394129803. The reversal of 38394129778 is 87792149383.

It can be written as a sum of positive squares in 2 ways, for example, as 37839197529 + 554932249 = 194523^2 + 23557^2 .

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

It is not an unprimeable number, because it can be changed into a prime (38394129773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55482501 + ... + 55483192.

Almost surely, 2^38394129778 is an apocalyptic number.

38394129778 is a deficient number, since it is larger than the sum of its proper divisors (19529962490).

38394129778 is a wasteful number, since it uses less digits than its factorization.

38394129778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110965868.

The product of its digits is 18289152, while the sum is 61.

The spelling of 38394129778 in words is "thirty-eight billion, three hundred ninety-four million, one hundred twenty-nine thousand, seven hundred seventy-eight".