38721139 has 16 divisors (see below), whose sum is σ = 41144320. Its totient is φ = 36391680.

The previous prime is 38721131. The next prime is 38721161. The reversal of 38721139 is 93112783.

It is a cyclic number.

It is not a de Polignac number, because 38721139 - 2³ = 38721131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38721131) 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, 237472 + ... + 237634.

It is an arithmetic number, because the mean of its divisors is an integer number (2571520).

Almost surely, 2^38721139 is an apocalyptic number.

38721139 is a deficient number, since it is larger than the sum of its proper divisors (2423181).

38721139 is a wasteful number, since it uses less digits than its factorization.

38721139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370.

The product of its digits is 9072, while the sum is 34.

The square root of 38721139 is about 6222.6311958849. The cubic root of 38721139 is about 338.3109395474.

The spelling of 38721139 in words is "thirty-eight million, seven hundred twenty-one thousand, one hundred thirty-nine".