38781009 has 6 divisors (see below), whose sum is σ = 56017026. Its totient is φ = 25854000.

The previous prime is 38780947. The next prime is 38781011. The reversal of 38781009 is 90018783.

It can be written as a sum of positive squares in only one way, i.e., 37859409 + 921600 = 6153^2 + 960^2 .

It is not a de Polignac number, because 38781009 - 2¹⁶ = 38715473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38781049) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2154492 + ... + 2154509.

It is an arithmetic number, because the mean of its divisors is an integer number (9336171).

Almost surely, 2^38781009 is an apocalyptic number.

It is an amenable number.

38781009 is a deficient number, since it is larger than the sum of its proper divisors (17236017).

38781009 is a wasteful number, since it uses less digits than its factorization.

38781009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309007 (or 4309004 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 38781009 is about 6227.4400037254. The cubic root of 38781009 is about 338.4852133961.

The spelling of 38781009 in words is "thirty-eight million, seven hundred eighty-one thousand, nine".