39720073 has 2 divisors, whose sum is σ = 39720074. Its totient is φ = 39720072.

The previous prime is 39720071. The next prime is 39720113. The reversal of 39720073 is 37002793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 19035769 = 4548^2 + 4363^2 .

It is a cyclic number.

It is not a de Polignac number, because 39720073 - 2¹ = 39720071 is a prime.

Together with 39720071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39720071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19860036 + 19860037.

It is an arithmetic number, because the mean of its divisors is an integer number (19860037).

Almost surely, 2^39720073 is an apocalyptic number.

It is an amenable number.

39720073 is a deficient number, since it is larger than the sum of its proper divisors (1).

39720073 is an equidigital number, since it uses as much as digits as its factorization.

39720073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 31.

The square root of 39720073 is about 6302.3862940953. The cubic root of 39720073 is about 341.1955403350.

The spelling of 39720073 in words is "thirty-nine million, seven hundred twenty thousand, seventy-three".