649835 has 4 divisors (see below), whose sum is σ = 779808. Its totient is φ = 519864.

The previous prime is 649829. The next prime is 649843. The reversal of 649835 is 538946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 538946 = 2 ⋅269473.

It is a cyclic number.

It is not a de Polignac number, because 649835 - 2⁶ = 649771 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649795 and 649804.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649835.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64979 + ... + 64988.

It is an arithmetic number, because the mean of its divisors is an integer number (194952).

2⁶⁴⁹⁸³⁵ is an apocalyptic number.

649835 is a deficient number, since it is larger than the sum of its proper divisors (129973).

649835 is a wasteful number, since it uses less digits than its factorization.

649835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129972.

The product of its digits is 25920, while the sum is 35.

The square root of 649835 is about 806.1234396791. The cubic root of 649835 is about 86.6165801983.

Subtracting from 649835 its reverse (538946), we obtain a square (110889 = 333²).

The spelling of 649835 in words is "six hundred forty-nine thousand, eight hundred thirty-five".