39929385985 has 8 divisors (see below), whose sum is σ = 47921967720. Its totient is φ = 31939039104.

The previous prime is 39929385971. The next prime is 39929386001. The reversal of 39929385985 is 58958392993.

It can be written as a sum of positive squares in 4 ways, for example, as 858724416 + 39070661569 = 29304^2 + 197663^2 .

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 39929385985 - 2⁷ = 39929385857 is a prime.

It is a super-2 number, since 2×39929385985² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519150 + ... + 591079.

It is an arithmetic number, because the mean of its divisors is an integer number (5990245965).

Almost surely, 2^39929385985 is an apocalyptic number.

It is an amenable number.

39929385985 is a deficient number, since it is larger than the sum of its proper divisors (7992581735).

39929385985 is a wasteful number, since it uses less digits than its factorization.

39929385985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117427.

The product of its digits is 188956800, while the sum is 70.

The spelling of 39929385985 in words is "thirty-nine billion, nine hundred twenty-nine million, three hundred eighty-five thousand, nine hundred eighty-five".