840109986 has 12 divisors (see below), whose sum is σ = 1820238342. Its totient is φ = 280036656.

The previous prime is 840109939. The next prime is 840110003. The reversal of 840109986 is 689901048.

It can be written as a sum of positive squares in only one way, i.e., 724955625 + 115154361 = 26925^2 + 10731^2 .

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 5 ways as a sum of consecutive naturals, for example, 23336371 + ... + 23336406.

Almost surely, 2^840109986 is an apocalyptic number.

840109986 is an abundant number, since it is smaller than the sum of its proper divisors (980128356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840109986 is a wasteful number, since it uses less digits than its factorization.

840109986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46672785 (or 46672782 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 840109986 is about 28984.6508690376. The cubic root of 840109986 is about 943.5799752415.

The spelling of 840109986 in words is "eight hundred forty million, one hundred nine thousand, nine hundred eighty-six".