38121209 has 16 divisors (see below), whose sum is σ = 44371968. Its totient is φ = 32078592.

The previous prime is 38121199. The next prime is 38121221. The reversal of 38121209 is 90212183.

It is a de Polignac number, because none of the positive numbers 2^k-38121209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38121229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121637 + ... + 121949.

It is an arithmetic number, because the mean of its divisors is an integer number (2773248).

Almost surely, 2^38121209 is an apocalyptic number.

It is an amenable number.

38121209 is a deficient number, since it is larger than the sum of its proper divisors (6250759).

38121209 is a wasteful number, since it uses less digits than its factorization.

38121209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 38121209 is about 6174.2375237757. The cubic root of 38121209 is about 336.5546189013.

The spelling of 38121209 in words is "thirty-eight million, one hundred twenty-one thousand, two hundred nine".