39191992085 has 8 divisors (see below), whose sum is σ = 47033883960. Its totient is φ = 31351264704.

The previous prime is 39191992069. The next prime is 39191992121. The reversal of 39191992085 is 58029919193.

It can be written as a sum of positive squares in 4 ways, for example, as 26721133156 + 12470858929 = 163466^2 + 111673^2 .

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 39191992085 - 2⁴ = 39191992069 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39191992085.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 215282 + ... + 353171.

It is an arithmetic number, because the mean of its divisors is an integer number (5879235495).

Almost surely, 2^39191992085 is an apocalyptic number.

It is an amenable number.

39191992085 is a deficient number, since it is larger than the sum of its proper divisors (7841891875).

39191992085 is a wasteful number, since it uses less digits than its factorization.

39191992085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582247.

The product of its (nonzero) digits is 1574640, while the sum is 56.

The spelling of 39191992085 in words is "thirty-nine billion, one hundred ninety-one million, nine hundred ninety-two thousand, eighty-five".