39138109 has 2 divisors, whose sum is σ = 39138110. Its totient is φ = 39138108.

The previous prime is 39138103. The next prime is 39138133. The reversal of 39138109 is 90183193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37822500 + 1315609 = 6150^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 39138109 - 2⁹ = 39137597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39138103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19569054 + 19569055.

It is an arithmetic number, because the mean of its divisors is an integer number (19569055).

Almost surely, 2^39138109 is an apocalyptic number.

It is an amenable number.

39138109 is a deficient number, since it is larger than the sum of its proper divisors (1).

39138109 is an equidigital number, since it uses as much as digits as its factorization.

39138109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 39138109 is about 6256.0457958682. The cubic root of 39138109 is about 339.5209776767.

The spelling of 39138109 in words is "thirty-nine million, one hundred thirty-eight thousand, one hundred nine".