649447 has 4 divisors (see below), whose sum is σ = 652536. Its totient is φ = 646360.

The previous prime is 649427. The next prime is 649457. The reversal of 649447 is 744946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744946 = 2 ⋅372473.

It is a cyclic number.

It is not a de Polignac number, because 649447 - 2¹¹ = 647399 is a prime.

It is a Duffinian number.

649447 is a lucky number.

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 (649427) 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, 1204 + ... + 1657.

It is an arithmetic number, because the mean of its divisors is an integer number (163134).

2⁶⁴⁹⁴⁴⁷ is an apocalyptic number.

649447 is a deficient number, since it is larger than the sum of its proper divisors (3089).

649447 is a wasteful number, since it uses less digits than its factorization.

649447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088.

The product of its digits is 24192, while the sum is 34.

The square root of 649447 is about 805.8827458136. The cubic root of 649447 is about 86.5993379117.

The spelling of 649447 in words is "six hundred forty-nine thousand, four hundred forty-seven".