649439 has 12 divisors (see below), whose sum is σ = 786384. Its totient is φ = 525312.

The previous prime is 649427. The next prime is 649457. The reversal of 649439 is 934946.

It is a happy number.

It is not a de Polignac number, because 649439 - 2⁴ = 649423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649399 and 649408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2399 + ... + 2655.

It is an arithmetic number, because the mean of its divisors is an integer number (65532).

2⁶⁴⁹⁴³⁹ is an apocalyptic number.

649439 is a deficient number, since it is larger than the sum of its proper divisors (136945).

649439 is a wasteful number, since it uses less digits than its factorization.

649439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 283 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 649439 is about 805.8777822970. The cubic root of 649439 is about 86.5989823283.

The spelling of 649439 in words is "six hundred forty-nine thousand, four hundred thirty-nine".