39139965 has 12 divisors (see below), whose sum is σ = 67842684. Its totient is φ = 20874624.

The previous prime is 39139927. The next prime is 39140027. The reversal of 39139965 is 56993193.

It can be written as a sum of positive squares in 2 ways, for example, as 11985444 + 27154521 = 3462^2 + 5211^2 .

It is not a de Polignac number, because 39139965 - 2⁶ = 39139901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 869777 = 39139965 / (3 + 9 + 1 + 3 + 9 + 9 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 39139965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434844 + ... + 434933.

It is an arithmetic number, because the mean of its divisors is an integer number (5653557).

Almost surely, 2^39139965 is an apocalyptic number.

It is an amenable number.

39139965 is a deficient number, since it is larger than the sum of its proper divisors (28702719).

39139965 is a wasteful number, since it uses less digits than its factorization.

39139965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869788 (or 869785 counting only the distinct ones).

The product of its digits is 196830, while the sum is 45.

The square root of 39139965 is about 6256.1941306197. The cubic root of 39139965 is about 339.5263444917.

It can be divided in two parts, 39139 and 965, that added together give a palindrome (40104).

The spelling of 39139965 in words is "thirty-nine million, one hundred thirty-nine thousand, nine hundred sixty-five".