649518 has 16 divisors (see below), whose sum is σ = 1312896. Its totient is φ = 214200.

The previous prime is 649511. The next prime is 649529. The reversal of 649518 is 815946.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649511) by changing a digit.

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, 93 + ... + 1143.

It is an arithmetic number, because the mean of its divisors is an integer number (82056).

2⁶⁴⁹⁵¹⁸ is an apocalyptic number.

649518 is an abundant number, since it is smaller than the sum of its proper divisors (663378).

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

649518 is a wasteful number, since it uses less digits than its factorization.

649518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159.

The product of its digits is 8640, while the sum is 33.

The square root of 649518 is about 805.9267956831. The cubic root of 649518 is about 86.6024935856.

The spelling of 649518 in words is "six hundred forty-nine thousand, five hundred eighteen".