838989985 has 16 divisors (see below), whose sum is σ = 1058054976. Its totient is φ = 637858368.

The previous prime is 838989953. The next prime is 838989989. The reversal of 838989985 is 589989838.

It is a cyclic number.

It is not a de Polignac number, because 838989985 - 2⁵ = 838989953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 838989985.

It is not an unprimeable number, because it can be changed into a prime (838989989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44779 + ... + 60688.

It is an arithmetic number, because the mean of its divisors is an integer number (66128436).

Almost surely, 2^838989985 is an apocalyptic number.

It is an amenable number.

838989985 is a deficient number, since it is larger than the sum of its proper divisors (219064991).

838989985 is a wasteful number, since it uses less digits than its factorization.

838989985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105552.

The product of its digits is 44789760, while the sum is 67.

The square root of 838989985 is about 28965.3238373059. The cubic root of 838989985 is about 943.1604744166.

The spelling of 838989985 in words is "eight hundred thirty-eight million, nine hundred eighty-nine thousand, nine hundred eighty-five".