39720245 has 8 divisors (see below), whose sum is σ = 50468184. Its totient is φ = 29906944.

The previous prime is 39720179. The next prime is 39720257. The reversal of 39720245 is 54202793.

It is a happy number.

39720245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1069156 + 38651089 = 1034^2 + 6217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39720245 - 2¹⁰ = 39719221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 233564 + ... + 233733.

It is an arithmetic number, because the mean of its divisors is an integer number (6308523).

Almost surely, 2^39720245 is an apocalyptic number.

It is an amenable number.

39720245 is a deficient number, since it is larger than the sum of its proper divisors (10747939).

39720245 is a wasteful number, since it uses less digits than its factorization.

39720245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467319.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 39720245 is about 6302.3999397055. The cubic root of 39720245 is about 341.1960328278.

The spelling of 39720245 in words is "thirty-nine million, seven hundred twenty thousand, two hundred forty-five".