38784645 has 12 divisors (see below), whose sum is σ = 67226796. Its totient is φ = 20685120.

The previous prime is 38784637. The next prime is 38784649. The reversal of 38784645 is 54648783.

It can be written as a sum of positive squares in 2 ways, for example, as 5225796 + 33558849 = 2286^2 + 5793^2 .

It is not a de Polignac number, because 38784645 - 2³ = 38784637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 861881 = 38784645 / (3 + 8 + 7 + 8 + 4 + 6 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 38784645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38784649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430896 + ... + 430985.

It is an arithmetic number, because the mean of its divisors is an integer number (5602233).

Almost surely, 2^38784645 is an apocalyptic number.

It is an amenable number.

38784645 is a deficient number, since it is larger than the sum of its proper divisors (28442151).

38784645 is a wasteful number, since it uses less digits than its factorization.

38784645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861892 (or 861889 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 38784645 is about 6227.7319306470. The cubic root of 38784645 is about 338.4957915443.

The spelling of 38784645 in words is "thirty-eight million, seven hundred eighty-four thousand, six hundred forty-five".