649489 has 4 divisors (see below), whose sum is σ = 651700. Its totient is φ = 647280.

The previous prime is 649487. The next prime is 649499. The reversal of 649489 is 984946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 166464 + 483025 = 408^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 649489 - 2¹ = 649487 is a prime.

It is a super-2 number, since 2×649489² = 843671922242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582 + ... + 1279.

It is an arithmetic number, because the mean of its divisors is an integer number (162925).

2⁶⁴⁹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

649489 is a deficient number, since it is larger than the sum of its proper divisors (2211).

649489 is a wasteful number, since it uses less digits than its factorization.

649489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210.

The product of its digits is 62208, while the sum is 40.

The square root of 649489 is about 805.9088037737. The cubic root of 649489 is about 86.6012046761.

The spelling of 649489 in words is "six hundred forty-nine thousand, four hundred eighty-nine".