219939840 has 352 divisors, whose sum is σ = 821420160. Its totient is φ = 55738368.

The previous prime is 219939809. The next prime is 219939847. The reversal of 219939840 is 48939912.

219939840 is a `hidden beast` number, since 219 + 9 + 398 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (219939847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5114859 + ... + 5114901.

It is an arithmetic number, because the mean of its divisors is an integer number (2333580).

Almost surely, 2^219939840 is an apocalyptic number.

219939840 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 219939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (410710080).

219939840 is an abundant number, since it is smaller than the sum of its proper divisors (601480320).

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

219939840 is a wasteful number, since it uses less digits than its factorization.

219939840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 219939840 is about 14830.3688423451. The cubic root of 219939840 is about 603.6260422187.

The spelling of 219939840 in words is "two hundred nineteen million, nine hundred thirty-nine thousand, eight hundred forty".