39123221 has 4 divisors (see below), whose sum is σ = 39139200. Its totient is φ = 39107244.

The previous prime is 39123193. The next prime is 39123229. The reversal of 39123221 is 12232193.

39123221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12232193 = 997 ⋅12269.

It is a cyclic number.

It is not a de Polignac number, because 39123221 - 2¹⁸ = 38861077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39123229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461 + ... + 9498.

It is an arithmetic number, because the mean of its divisors is an integer number (9784800).

Almost surely, 2^39123221 is an apocalyptic number.

It is an amenable number.

39123221 is a deficient number, since it is larger than the sum of its proper divisors (15979).

39123221 is a wasteful number, since it uses less digits than its factorization.

39123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15978.

The product of its digits is 648, while the sum is 23.

The square root of 39123221 is about 6254.8557937014. The cubic root of 39123221 is about 339.4779213520.

The spelling of 39123221 in words is "thirty-nine million, one hundred twenty-three thousand, two hundred twenty-one".