649836 has 48 divisors (see below), whose sum is σ = 1841280. Its totient is φ = 196560.

The previous prime is 649829. The next prime is 649843. The reversal of 649836 is 638946.

649836 is a `hidden beast` number, since 649 + 8 + 3 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (649829) and next prime (649843).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 649836.

It is a congruent number.

It is an unprimeable number.

649836 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 15 ways as a sum of consecutive naturals, for example, 915 + ... + 1461.

It is an arithmetic number, because the mean of its divisors is an integer number (38360).

2⁶⁴⁹⁸³⁶ is an apocalyptic number.

649836 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (920640).

649836 is an abundant number, since it is smaller than the sum of its proper divisors (1191444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649836 is a wasteful number, since it uses less digits than its factorization.

649836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 563 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 649836 is about 806.1240599312. The cubic root of 649836 is about 86.6166246283.

It can be divided in two parts, 649 and 836, that added together give a triangular number (1485 = T₅₄).

The spelling of 649836 in words is "six hundred forty-nine thousand, eight hundred thirty-six".