985139905 has 8 divisors (see below), whose sum is σ = 1193216832. Its totient is φ = 780745968.

The previous prime is 985139899. The next prime is 985139941. The reversal of 985139905 is 509931589.

It is a happy number.

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 985139905 - 2¹⁹ = 984615617 is a prime.

It is a Duffinian 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, 920157 + ... + 921226.

It is an arithmetic number, because the mean of its divisors is an integer number (149152104).

Almost surely, 2^985139905 is an apocalyptic number.

It is an amenable number.

985139905 is a deficient number, since it is larger than the sum of its proper divisors (208076927).

985139905 is a wasteful number, since it uses less digits than its factorization.

985139905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841495.

The product of its (nonzero) digits is 437400, while the sum is 49.

The square root of 985139905 is about 31386.9384457930. The cubic root of 985139905 is about 995.0218945882.

The spelling of 985139905 in words is "nine hundred eighty-five million, one hundred thirty-nine thousand, nine hundred five".