649539 has 22 divisors (see below), whose sum is σ = 1062876. Its totient is φ = 393660.

The previous prime is 649529. The next prime is 649541. The reversal of 649539 is 935946.

649539 is a `hidden beast` number, since 649 + 5 + 3 + 9 = 666.

649539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 649539 - 2⁵ = 649507 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649539.

It is not an unprimeable number, because it can be changed into a prime (649529) by changing a digit.

It is a polite number, since it can be written in 21 ways as a sum of consecutive naturals, for example, 59044 + ... + 59054.

649539 is a Friedman number, since it can be written as 9^5*(9+(4*3)/6), using all its digits and the basic arithmetic operations.

2⁶⁴⁹⁵³⁹ is an apocalyptic number.

649539 is a deficient number, since it is larger than the sum of its proper divisors (413337).

649539 is an frugal number, since it uses more digits than its factorization.

649539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41 (or 14 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 649539 is about 805.9398240564. The cubic root of 649539 is about 86.6034269099.

The spelling of 649539 in words is "six hundred forty-nine thousand, five hundred thirty-nine".