39193939 has 4 divisors (see below), whose sum is σ = 39246880. Its totient is φ = 39141000.

The previous prime is 39193933. The next prime is 39193949. The reversal of 39193939 is 93939193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93939193 = 103 ⋅912031.

It is a cyclic number.

It is not a de Polignac number, because 39193939 - 2⁵ = 39193907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39193933) 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, 25344 + ... + 26845.

It is an arithmetic number, because the mean of its divisors is an integer number (9811720).

Almost surely, 2^39193939 is an apocalyptic number.

39193939 is a deficient number, since it is larger than the sum of its proper divisors (52941).

39193939 is an equidigital number, since it uses as much as digits as its factorization.

39193939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52940.

The product of its digits is 177147, while the sum is 46.

The square root of 39193939 is about 6260.5062894306. The cubic root of 39193939 is about 339.6823417161.

The spelling of 39193939 in words is "thirty-nine million, one hundred ninety-three thousand, nine hundred thirty-nine".