38158139 has 2 divisors, whose sum is σ = 38158140. Its totient is φ = 38158138.

The previous prime is 38158121. The next prime is 38158147. The reversal of 38158139 is 93185183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38158139 - 2¹² = 38154043 is a prime.

It is not a weakly prime, because it can be changed into another prime (38158189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19079069 + 19079070.

It is an arithmetic number, because the mean of its divisors is an integer number (19079070).

Almost surely, 2^38158139 is an apocalyptic number.

38158139 is a deficient number, since it is larger than the sum of its proper divisors (1).

38158139 is an equidigital number, since it uses as much as digits as its factorization.

38158139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 38158139 is about 6177.2274525065. The cubic root of 38158139 is about 336.6632631533.

The spelling of 38158139 in words is "thirty-eight million, one hundred fifty-eight thousand, one hundred thirty-nine".