38139613 has 2 divisors, whose sum is σ = 38139614. Its totient is φ = 38139612.

The previous prime is 38139601. The next prime is 38139617. The reversal of 38139613 is 31693183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29127609 + 9012004 = 5397^2 + 3002^2 .

It is an emirp because it is prime and its reverse (31693183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38139613 - 2¹³ = 38131421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38139617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19069806 + 19069807.

It is an arithmetic number, because the mean of its divisors is an integer number (19069807).

Almost surely, 2^38139613 is an apocalyptic number.

It is an amenable number.

38139613 is a deficient number, since it is larger than the sum of its proper divisors (1).

38139613 is an equidigital number, since it uses as much as digits as its factorization.

38139613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 38139613 is about 6175.7277303974. The cubic root of 38139613 is about 336.6087703381.

The spelling of 38139613 in words is "thirty-eight million, one hundred thirty-nine thousand, six hundred thirteen".