38965809 has 4 divisors (see below), whose sum is σ = 51954416. Its totient is φ = 25977204.

The previous prime is 38965781. The next prime is 38965811. The reversal of 38965809 is 90856983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 38965809 - 2¹¹ = 38963761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38965889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6494299 + ... + 6494304.

It is an arithmetic number, because the mean of its divisors is an integer number (12988604).

Almost surely, 2^38965809 is an apocalyptic number.

It is an amenable number.

38965809 is a deficient number, since it is larger than the sum of its proper divisors (12988607).

38965809 is a wasteful number, since it uses less digits than its factorization.

38965809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12988606.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 38965809 is about 6242.2599273020. The cubic root of 38965809 is about 339.0220136939.

The spelling of 38965809 in words is "thirty-eight million, nine hundred sixty-five thousand, eight hundred nine".