38684989 has 16 divisors (see below), whose sum is σ = 45156096. Its totient is φ = 32457600.

The previous prime is 38684983. The next prime is 38684999. The reversal of 38684989 is 98948683.

38684989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38684989 - 2³ = 38684981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38684981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137529 + ... + 137809.

It is an arithmetic number, because the mean of its divisors is an integer number (2822256).

Almost surely, 2^38684989 is an apocalyptic number.

38684989 is the 3934-th heptagonal number.

It is an amenable number.

38684989 is a deficient number, since it is larger than the sum of its proper divisors (6471107).

38684989 is a wasteful number, since it uses less digits than its factorization.

38684989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its digits is 2985984, while the sum is 55.

The square root of 38684989 is about 6219.7257978146. The cubic root of 38684989 is about 338.2056245635.

The spelling of 38684989 in words is "thirty-eight million, six hundred eighty-four thousand, nine hundred eighty-nine".