39780985 has 12 divisors (see below), whose sum is σ = 48432492. Its totient is φ = 31367808.

The previous prime is 39780973. The next prime is 39780989. The reversal of 39780985 is 58908793.

39780985 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 6 ways, for example, as 1687401 + 38093584 = 1299^2 + 6172^2 .

It is not a de Polignac number, because 39780985 - 2⁹ = 39780473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39780989) 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 11 ways as a sum of consecutive naturals, for example, 25899 + ... + 27391.

It is an arithmetic number, because the mean of its divisors is an integer number (4036041).

Almost surely, 2^39780985 is an apocalyptic number.

It is an amenable number.

39780985 is a deficient number, since it is larger than the sum of its proper divisors (8651507).

39780985 is an equidigital number, since it uses as much as digits as its factorization.

39780985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1571 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 39780985 is about 6307.2168981255. The cubic root of 39780985 is about 341.3698626736.

The spelling of 39780985 in words is "thirty-nine million, seven hundred eighty thousand, nine hundred eighty-five".