649986 has 16 divisors (see below), whose sum is σ = 1311744. Its totient is φ = 214704.

The previous prime is 649981. The next prime is 649991. The reversal of 649986 is 689946.

It is an interprime number because it is at equal distance from previous prime (649981) and next prime (649991).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649986.

It is not an unprimeable number, because it can be changed into a prime (649981) by changing a digit.

649986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (81984).

2⁶⁴⁹⁹⁸⁶ is an apocalyptic number.

649986 is an abundant number, since it is smaller than the sum of its proper divisors (661758).

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

649986 is a wasteful number, since it uses less digits than its factorization.

649986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985.

The product of its digits is 93312, while the sum is 42.

The square root of 649986 is about 806.2170923517. The cubic root of 649986 is about 86.6232886144.

The spelling of 649986 in words is "six hundred forty-nine thousand, nine hundred eighty-six".