38139839 has 4 divisors (see below), whose sum is σ = 39026856. Its totient is φ = 37252824.

The previous prime is 38139833. The next prime is 38139847. The reversal of 38139839 is 93893183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93893183 = 1621 ⋅57923.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38139839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38139839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38139833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443444 + ... + 443529.

It is an arithmetic number, because the mean of its divisors is an integer number (9756714).

Almost surely, 2^38139839 is an apocalyptic number.

38139839 is a deficient number, since it is larger than the sum of its proper divisors (887017).

38139839 is an equidigital number, since it uses as much as digits as its factorization.

38139839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887016.

The product of its digits is 139968, while the sum is 44.

The square root of 38139839 is about 6175.7460278091. The cubic root of 38139839 is about 336.6094352061.

The spelling of 38139839 in words is "thirty-eight million, one hundred thirty-nine thousand, eight hundred thirty-nine".