649140 has 48 divisors (see below), whose sum is σ = 1881600. Its totient is φ = 167040.

The previous prime is 649123. The next prime is 649141. The reversal of 649140 is 41946.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 649140.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649140.

It is not an unprimeable number, because it can be changed into a prime (649141) by changing a digit.

649140 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, 1686 + ... + 2034.

It is an arithmetic number, because the mean of its divisors is an integer number (39200).

2⁶⁴⁹¹⁴⁰ is an apocalyptic number.

649140 is a gapful number since it is divisible by the number (60) 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 649140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940800).

649140 is an abundant number, since it is smaller than the sum of its proper divisors (1232460).

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

649140 is a wasteful number, since it uses less digits than its factorization.

649140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 649140 is about 805.6922489388. The cubic root of 649140 is about 86.5856903074.

The spelling of 649140 in words is "six hundred forty-nine thousand, one hundred forty".