38791609 has 2 divisors, whose sum is σ = 38791610. Its totient is φ = 38791608.

The previous prime is 38791583. The next prime is 38791661. The reversal of 38791609 is 90619783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36036009 + 2755600 = 6003^2 + 1660^2 .

It is an emirp because it is prime and its reverse (90619783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38791609 - 2⁷ = 38791481 is a prime.

It is not a weakly prime, because it can be changed into another prime (38791679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19395804 + 19395805.

It is an arithmetic number, because the mean of its divisors is an integer number (19395805).

Almost surely, 2^38791609 is an apocalyptic number.

It is an amenable number.

38791609 is a deficient number, since it is larger than the sum of its proper divisors (1).

38791609 is an equidigital number, since it uses as much as digits as its factorization.

38791609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 38791609 is about 6228.2910176067. The cubic root of 38791609 is about 338.5160499362.

The spelling of 38791609 in words is "thirty-eight million, seven hundred ninety-one thousand, six hundred nine".