649830 has 16 divisors (see below), whose sum is σ = 1559664. Its totient is φ = 173280.

The previous prime is 649829. The next prime is 649843. The reversal of 649830 is 38946.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 21661 = 649830 / (6 + 4 + 9 + 8 + 3 + 0).

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10801 + ... + 10860.

It is an arithmetic number, because the mean of its divisors is an integer number (97479).

2⁶⁴⁹⁸³⁰ is an apocalyptic number.

649830 is an abundant number, since it is smaller than the sum of its proper divisors (909834).

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

649830 is a wasteful number, since it uses less digits than its factorization.

649830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21671.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 649830 is about 806.1203384111. The cubic root of 649830 is about 86.6163580475.

The spelling of 649830 in words is "six hundred forty-nine thousand, eight hundred thirty".