39338721 has 48 divisors (see below), whose sum is σ = 63598080. Its totient is φ = 23328000.

The previous prime is 39338713. The next prime is 39338723. The reversal of 39338721 is 12783393.

It is a happy number.

It is not a de Polignac number, because 39338721 - 2³ = 39338713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39338723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 217251 + ... + 217431.

It is an arithmetic number, because the mean of its divisors is an integer number (1324960).

Almost surely, 2^39338721 is an apocalyptic number.

39338721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

39338721 is a deficient number, since it is larger than the sum of its proper divisors (24259359).

39338721 is a wasteful number, since it uses less digits than its factorization.

39338721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 275 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 39338721 is about 6272.0587529136. The cubic root of 39338721 is about 340.1000887569.

The spelling of 39338721 in words is "thirty-nine million, three hundred thirty-eight thousand, seven hundred twenty-one".