38394728545 has 4 divisors (see below), whose sum is σ = 46073674260. Its totient is φ = 30715782832.

The previous prime is 38394728521. The next prime is 38394728551. The reversal of 38394728545 is 54582749383.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54582749383 = 467 ⋅116879549.

It can be written as a sum of positive squares in 2 ways, for example, as 30056116689 + 8338611856 = 173367^2 + 91316^2 .

It is a cyclic number.

It is not a de Polignac number, because 38394728545 - 2⁷ = 38394728417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38394728545.

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, 3839472850 + ... + 3839472859.

It is an arithmetic number, because the mean of its divisors is an integer number (11518418565).

Almost surely, 2^38394728545 is an apocalyptic number.

It is an amenable number.

38394728545 is a deficient number, since it is larger than the sum of its proper divisors (7678945715).

38394728545 is an equidigital number, since it uses as much as digits as its factorization.

38394728545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7678945714.

The product of its digits is 29030400, while the sum is 58.

The spelling of 38394728545 in words is "thirty-eight billion, three hundred ninety-four million, seven hundred twenty-eight thousand, five hundred forty-five".