38919109 has 2 divisors, whose sum is σ = 38919110. Its totient is φ = 38919108.

The previous prime is 38919107. The next prime is 38919143. The reversal of 38919109 is 90191983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30636225 + 8282884 = 5535^2 + 2878^2 .

It is a cyclic number.

It is not a de Polignac number, because 38919109 - 2¹ = 38919107 is a prime.

Together with 38919107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38919107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19459554 + 19459555.

It is an arithmetic number, because the mean of its divisors is an integer number (19459555).

Almost surely, 2^38919109 is an apocalyptic number.

It is an amenable number.

38919109 is a deficient number, since it is larger than the sum of its proper divisors (1).

38919109 is an equidigital number, since it uses as much as digits as its factorization.

38919109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 38919109 is about 6238.5181734127. The cubic root of 38919109 is about 338.8865217707.

The spelling of 38919109 in words is "thirty-eight million, nine hundred nineteen thousand, one hundred nine".