39138919 has 2 divisors, whose sum is σ = 39138920. Its totient is φ = 39138918.

The previous prime is 39138863. The next prime is 39138937. The reversal of 39138919 is 91983193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39138919 - 2¹⁷ = 39007847 is a prime.

It is a super-2 number, since 2×39138919² = 3063709960977122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39138949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19569459 + 19569460.

It is an arithmetic number, because the mean of its divisors is an integer number (19569460).

Almost surely, 2^39138919 is an apocalyptic number.

39138919 is a deficient number, since it is larger than the sum of its proper divisors (1).

39138919 is an equidigital number, since it uses as much as digits as its factorization.

39138919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 43.

The square root of 39138919 is about 6256.1105329110. The cubic root of 39138919 is about 339.5233198959.

The spelling of 39138919 in words is "thirty-nine million, one hundred thirty-eight thousand, nine hundred nineteen".