39072221 has 4 divisors (see below), whose sum is σ = 40025244. Its totient is φ = 38119200.

The previous prime is 39072217. The next prime is 39072283. The reversal of 39072221 is 12227093.

39072221 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.

It can be written as a sum of positive squares in 2 ways, for example, as 9369721 + 29702500 = 3061^2 + 5450^2 .

It is a cyclic number.

It is not a de Polignac number, because 39072221 - 2² = 39072217 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 (32072221) 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, 476450 + ... + 476531.

It is an arithmetic number, because the mean of its divisors is an integer number (10006311).

Almost surely, 2^39072221 is an apocalyptic number.

It is an amenable number.

39072221 is a deficient number, since it is larger than the sum of its proper divisors (953023).

39072221 is an equidigital number, since it uses as much as digits as its factorization.

39072221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953022.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 39072221 is about 6250.7776316231. Note that the first 3 decimals coincide. The cubic root of 39072221 is about 339.3303457171.

It can be divided in two parts, 39072 and 221, that added together give a palindrome (39293).

The spelling of 39072221 in words is "thirty-nine million, seventy-two thousand, two hundred twenty-one".