219640 has 48 divisors (see below), whose sum is σ = 552600. Its totient is φ = 78336.

The previous prime is 219629. The next prime is 219647. The reversal of 219640 is 46912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219647) 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 11 ways as a sum of consecutive naturals, for example, 11551 + ... + 11569.

2²¹⁹⁶⁴⁰ is an apocalyptic number.

219640 is a gapful number since it is divisible by the number (20) 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 219640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276300).

219640 is an abundant number, since it is smaller than the sum of its proper divisors (332960).

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

219640 is a wasteful number, since it uses less digits than its factorization.

219640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 219640 is about 468.6576575711. The cubic root of 219640 is about 60.3351613323.

The spelling of 219640 in words is "two hundred nineteen thousand, six hundred forty".