39720625 has 30 divisors (see below), whose sum is σ = 57783066. Its totient is φ = 27216000.

The previous prime is 39720623. The next prime is 39720643. The reversal of 39720625 is 52602793.

It is a happy number.

39720625 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 5 ways, for example, as 3732624 + 35988001 = 1932^2 + 5999^2 .

It is not a de Polignac number, because 39720625 - 2¹ = 39720623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39720623) 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 29 ways as a sum of consecutive naturals, for example, 29977 + ... + 31273.

Almost surely, 2^39720625 is an apocalyptic number.

39720625 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39720625 is a deficient number, since it is larger than the sum of its proper divisors (18062441).

39720625 is an equidigital number, since it uses as much as digits as its factorization.

39720625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 39720625 is about 6302.4300868792. The cubic root of 39720625 is about 341.1971208882.

The spelling of 39720625 in words is "thirty-nine million, seven hundred twenty thousand, six hundred twenty-five".