38309839 has 4 divisors (see below), whose sum is σ = 38481856. Its totient is φ = 38137824.

The previous prime is 38309819. The next prime is 38309849. The reversal of 38309839 is 93890383.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93890383 = 67 ⋅1401349.

It is a cyclic number.

It is not a de Polignac number, because 38309839 - 2⁵ = 38309807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 38309795 and 38309804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38309819) 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, 85674 + ... + 86119.

It is an arithmetic number, because the mean of its divisors is an integer number (9620464).

Almost surely, 2^38309839 is an apocalyptic number.

38309839 is a deficient number, since it is larger than the sum of its proper divisors (172017).

38309839 is a wasteful number, since it uses less digits than its factorization.

38309839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172016.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 38309839 is about 6189.4942442820. The cubic root of 38309839 is about 337.1088149870.

The spelling of 38309839 in words is "thirty-eight million, three hundred nine thousand, eight hundred thirty-nine".