38191939 has 4 divisors (see below), whose sum is σ = 38839320. Its totient is φ = 37544560.

The previous prime is 38191931. The next prime is 38191949. The reversal of 38191939 is 93919183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93919183 = 97 ⋅968239.

It is a cyclic number.

It is not a de Polignac number, because 38191939 - 2³ = 38191931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 38191895 and 38191904.

It is not an unprimeable number, because it can be changed into a prime (38191931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323602 + ... + 323719.

It is an arithmetic number, because the mean of its divisors is an integer number (9709830).

Almost surely, 2^38191939 is an apocalyptic number.

38191939 is a deficient number, since it is larger than the sum of its proper divisors (647381).

38191939 is an equidigital number, since it uses as much as digits as its factorization.

38191939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647380.

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

The square root of 38191939 is about 6179.9627021528. The cubic root of 38191939 is about 336.7626378467.

The spelling of 38191939 in words is "thirty-eight million, one hundred ninety-one thousand, nine hundred thirty-nine".