649718 has 8 divisors (see below), whose sum is σ = 981048. Its totient is φ = 322704.

The previous prime is 649717. The next prime is 649739. The reversal of 649718 is 817946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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 649718.

It is not an unprimeable number, because it can be changed into a prime (649717) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 671 + ... + 1322.

It is an arithmetic number, because the mean of its divisors is an integer number (122631).

2⁶⁴⁹⁷¹⁸ is an apocalyptic number.

649718 is a deficient number, since it is larger than the sum of its proper divisors (331330).

649718 is a wasteful number, since it uses less digits than its factorization.

649718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158.

The product of its digits is 12096, while the sum is 35.

The square root of 649718 is about 806.0508668812. The cubic root of 649718 is about 86.6113815719.

The spelling of 649718 in words is "six hundred forty-nine thousand, seven hundred eighteen".