649854 has 24 divisors (see below), whose sum is σ = 1428960. Its totient is φ = 213408.

The previous prime is 649849. The next prime is 649867. The reversal of 649854 is 458946.

649854 is a `hidden beast` number, since 649 + 8 + 5 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

649854 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 11 ways as a sum of consecutive naturals, for example, 1194 + ... + 1650.

It is an arithmetic number, because the mean of its divisors is an integer number (59540).

2⁶⁴⁹⁸⁵⁴ is an apocalyptic number.

649854 is an abundant number, since it is smaller than the sum of its proper divisors (779106).

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

649854 is a wasteful number, since it uses less digits than its factorization.

649854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 541 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 649854 is about 806.1352243886. The cubic root of 649854 is about 86.6174243608.

The spelling of 649854 in words is "six hundred forty-nine thousand, eight hundred fifty-four".