649490 has 16 divisors (see below), whose sum is σ = 1181952. Its totient is φ = 256944.

The previous prime is 649487. The next prime is 649499. The reversal of 649490 is 94946.

It is a happy number.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649499) 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, 767 + ... + 1373.

It is an arithmetic number, because the mean of its divisors is an integer number (73872).

2⁶⁴⁹⁴⁹⁰ is an apocalyptic number.

649490 is a deficient number, since it is larger than the sum of its proper divisors (532462).

649490 is a wasteful number, since it uses less digits than its factorization.

649490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 649490 is about 805.9094241911. The cubic root of 649490 is about 86.6012491219.

The spelling of 649490 in words is "six hundred forty-nine thousand, four hundred ninety".