649389 has 8 divisors (see below), whose sum is σ = 932512. Its totient is φ = 399600.

The previous prime is 649381. The next prime is 649403. The reversal of 649389 is 983946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649389 - 2³ = 649381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 16651 = 649389 / (6 + 4 + 9 + 3 + 8 + 9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8287 + ... + 8364.

It is an arithmetic number, because the mean of its divisors is an integer number (116564).

2⁶⁴⁹³⁸⁹ is an apocalyptic number.

It is an amenable number.

649389 is a deficient number, since it is larger than the sum of its proper divisors (283123).

649389 is a wasteful number, since it uses less digits than its factorization.

649389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16667.

The product of its digits is 46656, while the sum is 39.

The square root of 649389 is about 805.8467596262. The cubic root of 649389 is about 86.5967598665.

It can be divided in two parts, 64 and 9389, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 649389 in words is "six hundred forty-nine thousand, three hundred eighty-nine".