38720209 has 16 divisors (see below), whose sum is σ = 43868160. Its totient is φ = 33858000.

The previous prime is 38720207. The next prime is 38720219. The reversal of 38720209 is 90202783.

38720209 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 38720209 - 2¹ = 38720207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38720207) 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, 92202 + ... + 92620.

It is an arithmetic number, because the mean of its divisors is an integer number (2741760).

Almost surely, 2^38720209 is an apocalyptic number.

It is an amenable number.

38720209 is a deficient number, since it is larger than the sum of its proper divisors (5147951).

38720209 is a wasteful number, since it uses less digits than its factorization.

38720209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 38720209 is about 6222.5564682050. The cubic root of 38720209 is about 338.3082310209.

The spelling of 38720209 in words is "thirty-eight million, seven hundred twenty thousand, two hundred nine".