39138569 has 2 divisors, whose sum is σ = 39138570. Its totient is φ = 39138568.

The previous prime is 39138553. The next prime is 39138587. The reversal of 39138569 is 96583193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33779344 + 5359225 = 5812^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 39138569 - 2⁴ = 39138553 is a prime.

It is a super-2 number, since 2×39138569² = 3063655166735522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39138599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19569284 + 19569285.

It is an arithmetic number, because the mean of its divisors is an integer number (19569285).

Almost surely, 2^39138569 is an apocalyptic number.

It is an amenable number.

39138569 is a deficient number, since it is larger than the sum of its proper divisors (1).

39138569 is an equidigital number, since it uses as much as digits as its factorization.

39138569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 39138569 is about 6256.0825601969. The cubic root of 39138569 is about 339.5223078299.

The spelling of 39138569 in words is "thirty-nine million, one hundred thirty-eight thousand, five hundred sixty-nine".