649236 has 48 divisors (see below), whose sum is σ = 1774080. Its totient is φ = 180960.

The previous prime is 649217. The next prime is 649261. The reversal of 649236 is 632946.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

649236 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4891 + ... + 5021.

It is an arithmetic number, because the mean of its divisors is an integer number (36960).

2⁶⁴⁹²³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887040).

649236 is an abundant number, since it is smaller than the sum of its proper divisors (1124844).

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

649236 is a wasteful number, since it uses less digits than its factorization.

649236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 202 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 649236 is about 805.7518228338. The cubic root of 649236 is about 86.5899584244.

Subtracting from 649236 its reverse (632946), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 649236 in words is "six hundred forty-nine thousand, two hundred thirty-six".