39128609 has 8 divisors (see below), whose sum is σ = 42205632. Its totient is φ = 36061200.

The previous prime is 39128599. The next prime is 39128629. The reversal of 39128609 is 90682193.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39128609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39128629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7634 + ... + 11684.

It is an arithmetic number, because the mean of its divisors is an integer number (5275704).

Almost surely, 2^39128609 is an apocalyptic number.

It is an amenable number.

39128609 is a deficient number, since it is larger than the sum of its proper divisors (3077023).

39128609 is a wasteful number, since it uses less digits than its factorization.

39128609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4807.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 39128609 is about 6255.2864842467. The cubic root of 39128609 is about 339.4935047918.

It can be divided in two parts, 3912 and 8609, that added together give a palindrome (12521).

The spelling of 39128609 in words is "thirty-nine million, one hundred twenty-eight thousand, six hundred nine".