919986885 has 12 divisors (see below), whose sum is σ = 1594644012. Its totient is φ = 490659648.

The previous prime is 919986877. The next prime is 919986889. The reversal of 919986885 is 588689919.

It can be written as a sum of positive squares in 2 ways, for example, as 489382884 + 430604001 = 22122^2 + 20751^2 .

It is not a de Polignac number, because 919986885 - 2³ = 919986877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919986889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10222032 + ... + 10222121.

It is an arithmetic number, because the mean of its divisors is an integer number (132887001).

Almost surely, 2^919986885 is an apocalyptic number.

It is an amenable number.

919986885 is a deficient number, since it is larger than the sum of its proper divisors (674657127).

919986885 is a wasteful number, since it uses less digits than its factorization.

919986885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20444164 (or 20444161 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 63.

The square root of 919986885 is about 30331.2855810630. The cubic root of 919986885 is about 972.5842046380.

The spelling of 919986885 in words is "nine hundred nineteen million, nine hundred eighty-six thousand, eight hundred eighty-five".