649749 has 8 divisors (see below), whose sum is σ = 874720. Its totient is φ = 428976.

The previous prime is 649739. The next prime is 649751. The reversal of 649749 is 947946.

649749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 649749 - 2⁵ = 649717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (109340).

2⁶⁴⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

649749 is a deficient number, since it is larger than the sum of its proper divisors (224971).

649749 is a wasteful number, since it uses less digits than its factorization.

649749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099.

The product of its digits is 54432, while the sum is 39.

The square root of 649749 is about 806.0700962075. The cubic root of 649749 is about 86.6127590465.

The spelling of 649749 in words is "six hundred forty-nine thousand, seven hundred forty-nine".