39128569 has 8 divisors (see below), whose sum is σ = 40557960. Its totient is φ = 37704576.

The previous prime is 39128561. The next prime is 39128587. The reversal of 39128569 is 96582193.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23232400 + 15896169 = 4820^2 + 3987^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 39128569 - 2³ = 39128561 is a prime.

It is a super-2 number, since 2×39128569² = 3062089823975522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39128561) 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, 18637 + ... + 20629.

It is an arithmetic number, because the mean of its divisors is an integer number (5069745).

Almost surely, 2^39128569 is an apocalyptic number.

It is an amenable number.

39128569 is a deficient number, since it is larger than the sum of its proper divisors (1429391).

39128569 is a wasteful number, since it uses less digits than its factorization.

39128569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699.

The product of its digits is 116640, while the sum is 43.

The square root of 39128569 is about 6255.2832869503. The cubic root of 39128569 is about 339.4933891071.

The spelling of 39128569 in words is "thirty-nine million, one hundred twenty-eight thousand, five hundred sixty-nine".