39123939 has 4 divisors (see below), whose sum is σ = 52165256. Its totient is φ = 26082624.

The previous prime is 39123923. The next prime is 39123967. The reversal of 39123939 is 93932193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93932193 = 3 ⋅31310731.

It is not a de Polignac number, because 39123939 - 2⁴ = 39123923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39123897 and 39123906.

It is not an unprimeable number, because it can be changed into a prime (39123439) 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, 6520654 + ... + 6520659.

It is an arithmetic number, because the mean of its divisors is an integer number (13041314).

Almost surely, 2^39123939 is an apocalyptic number.

39123939 is a deficient number, since it is larger than the sum of its proper divisors (13041317).

39123939 is a wasteful number, since it uses less digits than its factorization.

39123939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13041316.

The product of its digits is 39366, while the sum is 39.

The square root of 39123939 is about 6254.9131888460. The cubic root of 39123939 is about 339.4799980697.

The spelling of 39123939 in words is "thirty-nine million, one hundred twenty-three thousand, nine hundred thirty-nine".